{"schema_version":"public-product-v1.1","generated_at":"2026-07-21T10:15:31Z","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-20190515-nxos-psvb","slug":"cisco-sa-20190515-nxos-psvb","vendor":"Cisco","title":"Cisco NX-OS Software Patch Signature Verification Bypass Vulnerability","summary":"A vulnerability in the Image Signature Verification feature of Cisco NX-OS Software could allow an authenticated, local attacker with administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image. 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-20190515-nxos-psvb","severity":"Medium","published_at":"2019-05-15T16:00:00Z","updated_at":"2019-05-15T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb","csaf_url":"https://sec.cloudapps.cisco.com/security/center/contentjson/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb/csaf/cisco-sa-20190515-nxos-psvb.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":3,"public_evidence_count":3,"kev_count":0,"highest_epss":0.00181},"cves":[{"id":"CVE-2019-1809","kev":false,"epss":{"score":0.00181,"percentile":0.07872,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:33Z"}}],"public_evidence":[{"product":{"name":"Cisco NX-OS Software","slug":"cisco-nx-os-software","vendor":"Cisco"},"cve":{"id":"CVE-2019-1809"},"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":"2026-07-20T04:19:23Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"7.0(0)N1(1); 7.0(1)N1(1); 7.0(1)N1(3); 7.0(2)I2(2c); 7.0(2)N1(1); 7.0(2)N1(1a); 7.0(3)F1(1); 7.0(3)F2(1); 7.0(3)F2(2); 7.0(3)F3(1); 7.0(3)F3(2); 7.0(3)F3(3); 7.0(3)F3(3a); 7.0(3)F3(3b); 7.0(3)F3(3c); 7.0(3)F3(4); 7.0(3)F3(5); 7.0(3)I1(1); 7.0(3)I1(1a); 7.0(3)I1(1b); 7.0(3)I1(2); 7.0(3)I1(3); 7.0(3)I1(3a); 7.0(3)I1(3b); 7.0(3)I2(1); 7.0(3)I2(1a); 7.0(3)I2(2); 7.0(3)I2(2a); 7.0(3)I2(2b); 7.0(3)I2(2c); 7.0(3)I2(2d); 7.0(3)I2(2e); 7.0(3)I2(3); 7.0(3)I2(4); 7.0(3)I2(5); 7.0(3)I3(1); 7.0(3)I4(1); 7.0(3)I4(2); 7.0(3)I4(3); 7.0(3)I4(4); 7.0(3)I4(5); 7.0(3)I4(6); 7.0(3)I4(7); 7.0(3)I4(8); 7.0(3)I4(8a); 7.0(3)I4(8b); 7.0(3)I4(8z); 7.0(3)I5(1); 7.0(3)I5(2); 7.0(3)I6(1); 7.0(3)I6(2); 7.0(3)I7(1); 7.0(3)I7(2); 7.0(3)I7(3); 7.0(3)I7(4); 7.0(3)I7(5); 7.0(3)I7(5a); 7.0(3)IX1(2); 7.0(3)IX1(2a); 7.0(3)N1(1); 7.0(4)N1(1); 7.0(4)N1(1a); 7.0(5)N1(1); 7.0(5)N1(1a); 7.0(6)N1(1); 7.0(6)N1(1c); 7.0(6)N1(2s); 7.0(6)N1(3s); 7.0(6)N1(4s); 7.0(7)N1(1); 7.0(7)N1(1a); 7.0(7)N1(1b); 7.0(8)N1(1); 7.0(8)N1(1a); 7.1(0)N1(1); 7.1(0)N1(1a); 7.1(0)N1(1b); 7.1(0)N1(2); 7.1(1)N1(1); 7.1(1)N1(1a); 7.1(2)N1(1); 7.1(2)N1(1a); 7.1(3)N1(1); 7.1(3)N1(1b); 7.1(3)N1(2); 7.1(3)N1(2.1); 7.1(3)N1(2a); 7.1(3)N1(3); 7.1(3)N1(3.12); 7.1(3)N1(4); 7.1(3)N1(5); 7.1(4)N1(1); 7.1(4)N1(1a); 7.1(4)N1(1c); 7.1(4)N1(1d); 7.1(4)N1(1e); 7.1(5)N1(1); 7.1(5)N1(1b); 7.2(0)D1(0.437); 7.2(0)D1(1); 7.2(0)N1(1); 7.2(0)ZZ(99.1); 7.2(1)D1(1); 7.2(1)N1(1); 7.2(2)D1(1); 7.2(2)D1(2); 7.3(0)D1(1); 7.3(0)DX(1); 7.3(0)DY(1); 7.3(0)N1(1); 7.3(0)N1(1a); 7.3(0)N1(1b); 7.3(0.2); 7.3(1)D1(1); 7.3(1)D1(1B); 7.3(1)DY(1); 7.3(1)N1(0.1); 7.3(1)N1(1); 7.3(2)D1(1); 7.3(2)D1(1A); 7.3(2)D1(2); 7.3(2)D1(3); 7.3(2)D1(3a); 7.3(2)N1(0.296); 7.3(2)N1(1)","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":0.00181,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:33Z"},"published_at":"2019-05-15T16:00:00Z","updated_at":"2019-05-15T16:00:00Z","advisory_updated_at":"2019-05-15T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb"},"row_display_order":1},{"product":{"name":"Cisco Adaptive Security Appliance (ASA) Software","slug":"cisco-adaptive-security-appliance-asa-software","vendor":"Cisco"},"cve":{"id":"CVE-2019-1809"},"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":"2026-07-20T04:19:23Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"7.0(3); 8.2(1); 8.2(2)","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":0.00181,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:33Z"},"published_at":"2019-05-15T16:00:00Z","updated_at":"2019-05-15T16:00:00Z","advisory_updated_at":"2019-05-15T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb"},"row_display_order":2},{"product":{"name":"Cisco Unified Computing System (Managed)","slug":"cisco-unified-computing-system-managed","vendor":"Cisco"},"cve":{"id":"CVE-2019-1809"},"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":"2026-07-20T04:19:23Z","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":0.00181,"score_date":"2026-07-20","updated_at":"2026-07-21T05:16:33Z"},"published_at":"2019-05-15T16:00:00Z","updated_at":"2019-05-15T16:00:00Z","advisory_updated_at":"2019-05-15T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-psvb"},"row_display_order":3}]}