{"schema_version":"public-product-v1.1","generated_at":"2026-07-21T09:59:04Z","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure.","advisory":{"id":"cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ","slug":"cisco-sa-ios-nxos-xr-udld-dos-w5hghgtq","vendor":"Cisco","title":"Multiple Cisco Operating Systems Unidirectional Link Detection Denial of Service Vulnerability","summary":"A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software, Cisco IOS Software, Cisco IOS XE Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload. This vulnerability is due to improper input validation of the UDLD packets. An attacker could exploit this vulnerability by sending specifically crafted UDLD packets to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. An attacker must have full control of a directly connected device. On Cisco IOS XR devices, the impact is limited to the reload of the UDLD process. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ This advisory is part of the September 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.","severity":"Medium","published_at":"2021-09-22T16:00:00Z","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","csaf_url":"https://sec.cloudapps.cisco.com/security/center/contentjson/CiscoSecurityAdvisory/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ/csaf/cisco-sa-ios-nxos-xr-udld-dos-W5hGHgtQ.json","exposure_verdict":"not_assessed","verdict_reason":"Public evidence does not evaluate exact release, platform, enabled features, configuration, compensating controls, or live exposure."},"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":{"cve_count":1,"visible_product_count":13,"public_evidence_count":13,"kev_count":0,"highest_epss":0.00404},"cves":[{"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"}}],"public_evidence":[{"product":{"name":"Cisco Nexus 5000 Series Switches","slug":"cisco-nexus-5000-series-switches","vendor":"Cisco"},"cve":{"id":"CVE-2021-34714"},"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"},"cve":{"id":"CVE-2021-34714"},"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"},"cve":{"id":"CVE-2021-34714"},"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"},"cve":{"id":"CVE-2021-34714"},"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"},"cve":{"id":"CVE-2021-34714"},"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"},"cve":{"id":"CVE-2021-34714"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product 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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"},"cve":{"id":"CVE-2021-34714"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco 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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"},"cve":{"id":"CVE-2021-34714"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco 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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"},"cve":{"id":"CVE-2021-34714"},"evidence_type":"structured_affected","evidence_label":{"scope":"CSAF product evidence","label":"product_status known affected"},"evidence_source":"Cisco CSAF","source":"Cisco 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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"},"cve":{"id":"CVE-2021-34714"},"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; 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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"},"cve":{"id":"CVE-2021-34714"},"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 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":12},{"product":{"name":"Cisco IOS XE Catalyst SD-WAN","slug":"cisco-ios-xe-catalyst-sd-wan","vendor":"Cisco"},"cve":{"id":"CVE-2021-34714"},"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":"16.10.1; 16.11.1a; 16.11.1b; 16.12.3; 16.12.4; 16.12.4a; 16.9.1; 16.9.2; 16.9.3; 16.9.4","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":13}]}