{"schema_version":"public-product-v1.1","generated_at":"2026-07-21T10:45:14Z","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","cve":{"id":"CVE-2021-34714","kev":false,"epss":{"score":0.00404,"percentile":0.3284,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"}},"freshness":{"last_source_refreshed_at":"2026-07-21T05:16:34Z","latest_source_refresh_at":"2026-07-21T05:16:34Z","oldest_source_refresh_at":"2026-07-21T03:00:03Z","all_sources_fresh":true,"sources":[{"source":"cisco_advisories","label":"Cisco advisories","last_success_at":"2026-07-21T03:00:03Z","stale":false},{"source":"cisco_csaf","label":"Cisco CSAF","last_success_at":"2026-07-21T05:14:24Z","stale":false},{"source":"nvd_cves","label":"NVD CVEs","last_success_at":"2026-07-21T05:16:30Z","stale":false},{"source":"cisa_kev","label":"CISA KEV","last_success_at":"2026-07-21T05:16:31Z","stale":false},{"source":"first_epss","label":"EPSS","last_success_at":"2026-07-21T05:16:34Z","stale":false}]},"summary":{"advisory_count":1,"visible_product_count":13,"public_evidence_count":13,"kev":false},"advisories":[{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"}],"public_evidence":[{"product":{"name":"Cisco Nexus 5000 Series Switches","slug":"cisco-nexus-5000-series-switches","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco NX-OS Software 7.3(0)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(0)N1(1a) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(0)N1(1b) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(1)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(2)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(2)N1(1b) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(2)N1(1c) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(3)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(4)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(4)N1(1a) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(5)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(6)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(6)N1(1a) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(7)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(7)N1(1a) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(7)N1(1b) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(8)N1(1) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(8)N1(1a) when installed on Cisco Nexus 5000 Series Switches; Cisco NX-OS Software 7.3(8)N1(1b) when installed on Cisco Nexus 5000 Series Switches","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":1},{"product":{"name":"Cisco Nexus 6000 Series Switches","slug":"cisco-nexus-6000-series-switches","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco NX-OS Software 7.3(0)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(0)N1(1a) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(0)N1(1b) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(1)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(2)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(2)N1(1b) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(2)N1(1c) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(3)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(4)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(4)N1(1a) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(5)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(6)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(6)N1(1a) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(7)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(7)N1(1a) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(7)N1(1b) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(8)N1(1) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(8)N1(1a) when installed on Cisco Nexus 6000 Series Switches; Cisco NX-OS Software 7.3(8)N1(1b) when installed on Cisco Nexus 6000 Series Switches","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":2},{"product":{"name":"Cisco Nexus 3000 Series Switches","slug":"cisco-nexus-3000-series-switches","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco NX-OS Software 6.0(2)A8(1) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(10) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(10a) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(11) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(11a) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(11b) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(3) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(4) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(4a) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(5) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(6) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(7) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(7a) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(7b) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(8) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 6.0(2)A8(9) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)F3(1) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)F3(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)F3(3) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)F3(3a) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)F3(3c) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)F3(4) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)F3(5) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(1) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(1t) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(3) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(4) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(5) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(6) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(6t) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(7) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(8) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(8a) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(8b) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(8z) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I4(9) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I5(1) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I5(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I5(3) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I5(3a) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I5(3b) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I6(1) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I6(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(1) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(3) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(3z) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(4) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(5) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(5a) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(6) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(6z) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(7) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(8) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(9) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)I7(9w) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 7.0(3)IM7(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.2(1) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.2(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.2(2t) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.2(2v) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.2(3) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.2(3y) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.2(4) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.3(1) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.3(2) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.3(3) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.3(4) when installed on Cisco Nexus 3000 Series Switches; Cisco NX-OS Software 9.3(5) when installed on Cisco Nexus 3000 Series Switches","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":3},{"product":{"name":"Cisco Nexus 9000 Series Switches","slug":"cisco-nexus-9000-series-switches","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco NX-OS Software 7.0(3)F3(1) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)F3(3) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)F3(3a) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)F3(3c) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)F3(4) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)F3(5) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(1) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(1t) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(2) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(3) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(4) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(5) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(6) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(6t) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(7) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(8) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(8a) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(8b) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(8z) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I4(9) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I5(1) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I5(2) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I5(3) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I5(3a) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I5(3b) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I6(1) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I6(2) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(1) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(2) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(3) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(3z) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(4) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(5) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(5a) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(6) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(7) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(8) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(9) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)I7(9w) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)IA7(1) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 7.0(3)IA7(2) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.2(1) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.2(2) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.2(3) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.2(3y) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.2(4) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.3(1) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.3(1z) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.3(2) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.3(3) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.3(4) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.3(5) when installed on Cisco Nexus 9000 Series Switches; Cisco NX-OS Software 9.3(5w) when installed on Cisco Nexus 9000 Series Switches","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":4},{"product":{"name":"Cisco MDS 9000 Multilayer Directors and Fabric Switches","slug":"cisco-mds-9000-multilayer-directors-and-fabric-switches","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco NX-OS Software 7.3(0)D1(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 7.3(0)DY(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 7.3(1)D1(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 7.3(1)DY(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.1(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.1(1a) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.1(1b) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.2(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.2(2) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.3(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.3(2) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.4(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.4(1a) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.4(2) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.4(2a) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches; Cisco NX-OS Software 8.4(2b) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switches","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":5},{"product":{"name":"Cisco Nexus 7000 Series Switches","slug":"cisco-nexus-7000-series-switches","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco NX-OS Software 7.3(0)D1(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(0)DX(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(1)D1(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(2)D1(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(2)D1(1d) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(2)D1(2) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(2)D1(3) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(2)D1(3a) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(3)D1(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(4)D1(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(5)D1(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 7.3(6)D1(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.1(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.1(2) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.1(2a) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.2(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.2(2) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.2(3) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.2(4) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.2(5) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.2(6) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.3(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.3(2) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.4(1) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.4(2) when installed on Cisco Nexus 7000 Series Switches; Cisco NX-OS Software 8.4(3) when installed on Cisco Nexus 7000 Series Switches","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":6},{"product":{"name":"Cisco Unified Computing System (Managed)","slug":"cisco-unified-computing-system-managed","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Unified Computing System (Managed)","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":7},{"product":{"name":"Cisco Firepower Extensible Operating System (FXOS)","slug":"cisco-firepower-extensible-operating-system-fxos","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco Firepower Extensible Operating System (FXOS)","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":8},{"product":{"name":"Cisco IOS XR Software","slug":"cisco-ios-xr-software","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"Cisco IOS XR Software","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live 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12.2(50)SG6; 12.2(50)SG7; 12.2(50)SG8; 12.2(50)SQ; 12.2(50)SQ1; 12.2(50)SQ2; 12.2(50)SQ3; 12.2(50)SQ4; 12.2(50)SQ5; 12.2(50)SQ6; 12.2(50)SQ7; 12.2(52)SG; 12.2(52)XO; 12.2(53)SG; 12.2(53)SG1; 12.2(53)SG10; 12.2(53)SG11; 12.2(53)SG2; 12.2(53)SG3; 12.2(53)SG4; 12.2(53)SG5; 12.2(53)SG6; 12.2(53)SG7; 12.2(53)SG8; 12.2(53)SG9; 12.2(54)SG; 12.2(54)SG1; 12.2(54)WO; 12.2(54)XO; 12.2(5b); 12.2(6)I1; 12.2(60)EZ11; 12.2(8)B1; 12.2(8)B2; 12.2(9)YO; 12.2(9)YO1; 12.2(9)YO2; 12.2(9)YO3; 12.2(9)YO4; 12.3(2)JA3; 12.3(2)JA4; 12.3(2)XT2; 12.3(2)XT3; 12.3(2)XZ1; 12.3(2)XZ2; 12.3(4)T2a; 12.3(4)XH; 12.3(4)XH1; 12.3(4)XN; 12.3(4)XN1; 12.3(4)XN2; 12.3(7)JX; 12.3(7)JX1; 12.3(7)JX10; 12.3(7)JX11; 12.3(7)JX12; 12.3(7)JX2; 12.3(7)JX3; 12.3(7)JX4; 12.3(7)JX5; 12.3(7)JX6; 12.3(7)JX7; 12.3(7)JX8; 12.3(7)JX9; 12.3(7)XI1b; 12.3(7)XI1c; 12.3(7)XI2a; 12.3(7)XI2b; 12.3(7)XI2c; 12.3(7)XI3b; 12.3(7)XI3d; 12.3(7)XI3e; 12.3(7)XI8c; 12.3(9)M0; 12.3(9)M1; 15.0(1)EX; 15.0(1)EY; 15.0(1)EY1; 15.0(1)EY2; 15.0(1)S; 15.0(1)S1; 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15.1(3)SVV3; 15.1(3)SVV4; 15.1(3)SVW; 15.1(3)SVW1; 15.1(3)SVX; 15.1(3)SVX1; 15.2(1)E; 15.2(1)E1; 15.2(1)E3; 15.2(1)S; 15.2(1)S1; 15.2(1)S2; 15.2(1)SC1a; 15.2(1)SD1; 15.2(1)SD2; 15.2(1)SD3; 15.2(1)SD4; 15.2(1)SD6; 15.2(1)SD6a; 15.2(1)SD7; 15.2(1)SD8; 15.2(1)SY; 15.2(1)SY0a; 15.2(1)SY1; 15.2(1)SY1a; 15.2(1)SY2; 15.2(1)SY3; 15.2(1)SY4; 15.2(1)SY5; 15.2(1)SY6; 15.2(1)SY7; 15.2(1)SY8; 15.2(2)E; 15.2(2)E1; 15.2(2)E10; 15.2(2)E2; 15.2(2)E3; 15.2(2)E4; 15.2(2)E5; 15.2(2)E5a; 15.2(2)E5b; 15.2(2)E6; 15.2(2)E7; 15.2(2)E8; 15.2(2)E9; 15.2(2)E9a; 15.2(2)S; 15.2(2)S1; 15.2(2)S2; 15.2(2)SC; 15.2(2)SC1; 15.2(2)SC3; 15.2(2)SC4; 15.2(2)SY; 15.2(2)SY1; 15.2(2)SY2; 15.2(2)SY3; 15.2(2a)E2; 15.2(2b)E; 15.2(3)E; 15.2(3)E1; 15.2(3)E2; 15.2(3)E3; 15.2(3)E4; 15.2(3a)E; 15.2(3m)E2; 15.2(3m)E7; 15.2(3m)E8; 15.2(4)E; 15.2(4)E1; 15.2(4)E10; 15.2(4)E10a; 15.2(4)E10b; 15.2(4)E2; 15.2(4)E3; 15.2(4)E4; 15.2(4)E5; 15.2(4)E6; 15.2(4)E7; 15.2(4)E8; 15.2(4)E9; 15.2(4)S; 15.2(4)S1; 15.2(4)S2; 15.2(4)S3a; 15.2(4)S4; 15.2(4)S4a; 15.2(4)S5; 15.2(4)S6; 15.2(4)S7; 15.2(4)S8; 15.2(4m)E1; 15.2(4m)E2; 15.2(4m)E3; 15.2(4n)E2; 15.2(4o)E2; 15.2(4o)E3; 15.2(4p)E1; 15.2(4q)E1; 15.2(4s)E1; 15.2(6)E0c; 15.2(7)E4; 15.2(7a)E0b; 15.2(7b)E0b; 15.2(8)E; 15.3(0)SY; 15.3(1)S; 15.3(1)S1; 15.3(1)S2; 15.3(1)SY; 15.3(1)SY1; 15.3(1)SY2; 15.3(2)S; 15.3(2)S1; 15.3(2)S2; 15.3(3)S; 15.3(3)S1; 15.3(3)S10; 15.3(3)S2; 15.3(3)S2a; 15.3(3)S3; 15.3(3)S4; 15.3(3)S5; 15.3(3)S6; 15.3(3)S6a; 15.3(3)S7; 15.3(3)S8; 15.3(3)S8a; 15.3(3)S9; 15.4(1)S; 15.4(1)S1; 15.4(1)S2; 15.4(1)S3; 15.4(1)S4; 15.4(1)SY; 15.4(1)SY1; 15.4(1)SY2; 15.4(1)SY3; 15.4(1)SY4; 15.4(2)S; 15.4(2)S1; 15.4(2)S2; 15.4(2)S3; 15.4(2)S4; 15.4(3)S; 15.4(3)S0e; 15.4(3)S0f; 15.4(3)S1; 15.4(3)S10; 15.4(3)S2; 15.4(3)S3; 15.4(3)S4; 15.4(3)S5; 15.4(3)S6; 15.4(3)S6a; 15.4(3)S7; 15.4(3)S8; 15.4(3)S9; 15.5(1)S; 15.5(1)S1; 15.5(1)S2; 15.5(1)S3; 15.5(1)S4; 15.5(1)SY; 15.5(1)SY1; 15.5(1)SY2; 15.5(1)SY3; 15.5(1)SY4; 15.5(1)SY5; 15.5(1)SY6; 15.5(1)SY7; 15.5(2)S; 15.5(2)S1; 15.5(2)S2; 15.5(2)S3; 15.5(2)S4; 15.5(3)S; 15.5(3)S0a; 15.5(3)S1; 15.5(3)S10; 15.5(3)S10a; 15.5(3)S10b; 15.5(3)S10c; 15.5(3)S2; 15.5(3)S3; 15.5(3)S4; 15.5(3)S5; 15.5(3)S6; 15.5(3)S6b; 15.5(3)S7; 15.5(3)S8; 15.5(3)S9; 15.5(3)S9a","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":10},{"product":{"name":"Cisco IOS XE Software","slug":"cisco-ios-xe-software","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"16.1.1; 16.1.2; 16.1.3; 16.10.1e; 16.10.1s; 16.11.1; 16.11.1c; 16.11.1s; 16.12.1; 16.12.1c; 16.12.1s; 16.12.2; 16.12.2s; 16.12.2t; 16.12.3a; 16.12.3s; 16.2.1; 16.2.2; 16.3.1; 16.3.10; 16.3.11; 16.3.1a; 16.3.2; 16.3.4; 16.3.5; 16.3.5b; 16.3.6; 16.3.7; 16.3.8; 16.3.9; 16.4.1; 16.5.1; 16.5.1a; 16.6.1; 16.6.2; 16.6.3; 16.6.4; 16.6.4a; 16.6.4s; 16.6.5; 16.6.6; 16.6.7; 16.6.8; 16.6.9; 16.7.1; 16.8.1; 16.8.1a; 16.8.1s; 16.9.1d; 16.9.1s; 16.9.2s; 16.9.3a; 16.9.3s; 16.9.5; 16.9.6; 16.9.7; 17.1.1; 17.1.1s; 17.1.1t; 17.1.2; 17.1.3; 17.2.1; 17.2.1a; 17.2.3; 17.3.1; 17.3.1a; 17.3.1w; 17.3.1x; 17.3.1z; 17.3.2; 17.3.2a; 17.4.1; 17.4.1a; 17.4.1b; 17.4.1c; 17.4.2; 17.4.2a; 3.10.0E; 3.10.0cE; 3.10.1E; 3.10.1aE; 3.10.1sE; 3.10.2E; 3.10.3E; 3.11.0E; 3.11.1E; 3.11.1aE; 3.11.2E; 3.11.2aE; 3.11.3E; 3.11.3aE; 3.11.4E; 3.18.2aSP; 3.2.0SE; 3.2.0SG; 3.2.10SG; 3.2.11SG; 3.2.1SE; 3.2.1SG; 3.2.2SE; 3.2.2SG; 3.2.3SE; 3.2.3SG; 3.2.4SG; 3.2.5SG; 3.2.6SG; 3.2.7SG; 3.2.8SG; 3.2.9SG; 3.3.0SE; 3.3.0SG; 3.3.0SQ; 3.3.1SE; 3.3.1SG; 3.3.1SQ; 3.3.2SE; 3.3.2SG; 3.3.3SE; 3.3.4SE; 3.3.5SE; 3.4.0SG; 3.4.0SQ; 3.4.1SG; 3.4.1SQ; 3.4.2SG; 3.4.3SG; 3.4.4SG; 3.4.5SG; 3.4.6SG; 3.4.7SG; 3.4.8SG; 3.5.0E; 3.5.0SQ; 3.5.1E; 3.5.1SQ; 3.5.2E; 3.5.2SQ; 3.5.3E; 3.5.3SQ; 3.5.4SQ; 3.5.5SQ; 3.5.6SQ; 3.5.7SQ; 3.5.8SQ; 3.6.0E; 3.6.0aE; 3.6.0bE; 3.6.10E; 3.6.1E; 3.6.2E; 3.6.2aE; 3.6.3E; 3.6.4E; 3.6.5E; 3.6.5aE; 3.6.5bE; 3.6.6E; 3.6.7E; 3.6.7aE; 3.6.7bE; 3.6.8E; 3.6.9E; 3.6.9aE; 3.7.0E; 3.7.1E; 3.7.2E; 3.7.3E; 3.7.4E; 3.7.5E; 3.8.0E; 3.8.10E; 3.8.1E; 3.8.2E; 3.8.3E; 3.8.4E; 3.8.5E; 3.8.5aE; 3.8.6E; 3.8.7E; 3.8.8E; 3.8.9E; 3.9.0E; 3.9.1E; 3.9.2E; 3.9.2bE","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","kev":false,"epss":{"score":0.00404,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:34Z"},"published_at":"2021-09-22T16:00:00Z","updated_at":"2021-09-22T16:00:00Z","advisory_updated_at":"2021-09-22T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"row_display_order":11},{"product":{"name":"Cisco Adaptive Security Appliance (ASA) Software","slug":"cisco-adaptive-security-appliance-asa-software","vendor":"Cisco"},"advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco CSAF","source_document_fetched_at":"2026-07-20T00:03:02Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"16.3.3","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","exposure_verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live 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