{"schema_version":"public-product-v1.1","generated_at":"2026-07-21T16:34:44Z","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-20190306-nx-os-lan-auth","slug":"cisco-sa-20190306-nx-os-lan-auth","vendor":"Cisco","title":"Cisco NX-OS Software 802.1X Extensible Authentication Protocol over LAN Denial of Service Vulnerability","summary":"A vulnerability in the 802.1X implementation for Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to incomplete input validation of Extensible Authentication Protocol over LAN (EAPOL) frames. An attacker could exploit this vulnerability by sending a crafted EAPOL frame to an interface on the targeted device. A successful exploit could allow the attacker to cause the Layer 2 (L2) forwarding process to restart multiple times, leading to a system-level restart of the device and a DoS condition. Note: This vulnerability affects only NX-OS devices configured with 802.1X functionality. 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-20190306-nx-os-lan-auth This advisory is part of the March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication, which includes 25 Cisco Security Advisories that describe 26 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.","severity":"High","published_at":"2019-03-06T16:00:00Z","updated_at":"2019-03-06T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth","csaf_url":"https://sec.cloudapps.cisco.com/security/center/contentjson/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth/csaf/cisco-sa-20190306-nx-os-lan-auth.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},"cves":[{"id":"CVE-2019-1594","kev":false}],"public_evidence":[{"product":{"name":"Cisco NX-OS Software","slug":"cisco-nx-os-software","vendor":"Cisco"},"cve":{"id":"CVE-2019-1594"},"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":"2026-07-20T04:25:34Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"4.0(1a)N1(1); 4.0(1a)N1(1a); 4.0(1a)N2(1); 4.0(1a)N2(1a); 4.2(1)N1(1); 4.2(1)N2(1); 4.2(1)N2(1a); 5.0(2)N1(1); 5.0(2)N2(1); 5.0(2)N2(1a); 5.0(3)N1(1); 5.0(3)N1(1a); 5.0(3)N1(1b); 5.0(3)N1(1c); 5.0(3)N2(1); 5.0(3)N2(2); 5.0(3)N2(2a); 5.0(3)N2(2b); 5.1(3)N1(1); 5.1(3)N1(1a); 5.1(3)N2(1); 5.1(3)N2(1a); 5.1(3)N2(1b); 5.1(3)N2(1c); 5.2(1)N1(1); 5.2(1)N1(1a); 5.2(1)N1(1b); 5.2(1)N1(2); 5.2(1)N1(2a); 5.2(1)N1(3); 5.2(1)N1(4); 5.2(1)N1(5); 5.2(1)N1(6); 5.2(1)N1(7); 5.2(1)N1(8); 5.2(1)N1(8a); 5.2(1)N1(8b); 5.2(1)N1(9); 5.2(1)N1(9a); 5.2(1)N1(9b); 5.2(1)SV3(1.3a); 5.2(1)SV3(1.3b); 5.2(1)SV3(1.3c); 5.2(3); 5.2(3a); 5.2(4); 5.2(7); 5.2(9); 5.2(9)N1(1); 5.2(9a); 6.0(2)N1(1); 6.0(2)N1(1a); 6.0(2)N1(2); 6.0(2)N1(2a); 6.0(2)N2(1); 6.0(2)N2(1b); 6.0(2)N2(2); 6.0(2)N2(3); 6.0(2)N2(4); 6.0(2)N2(5); 6.0(2)N2(5a); 6.0(2)N2(6); 6.0(2)N2(7); 6.1(3)S5; 6.1(3)S6; 6.1(4); 6.1(4a); 6.1(5a); 7.1(3)N1(2.1); 7.1(3)N1(3.12); 7.2(0)D1(0.437); 7.2(0)ZZ(99.1); 7.3(0.2); 7.3(1)D1(1B); 7.3(1)N1(0.1); 7.3(2)D1(1A); 7.3(2)N1(0.296); 8.0(1)S2","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,"published_at":"2019-03-06T16:00:00Z","updated_at":"2019-03-06T16:00:00Z","advisory_updated_at":"2019-03-06T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth"},"row_display_order":1},{"product":{"name":"Cisco Adaptive Security Appliance (ASA) Software","slug":"cisco-adaptive-security-appliance-asa-software","vendor":"Cisco"},"cve":{"id":"CVE-2019-1594"},"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":"2026-07-20T04:25:34Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"5.2(5); 6.1(1); 6.1(2); 6.1(3); 6.1(5)","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,"published_at":"2019-03-06T16:00:00Z","updated_at":"2019-03-06T16:00:00Z","advisory_updated_at":"2019-03-06T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth"},"row_display_order":2},{"product":{"name":"Cisco NX-OS System Software in ACI Mode","slug":"cisco-nx-os-system-software-in-aci-mode","vendor":"Cisco"},"cve":{"id":"CVE-2019-1594"},"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":"2026-07-20T04:25:34Z","csaf_status":"known_affected","csaf_product_status":"known_affected","csaf_product_status_path":"vulnerabilities[].product_status.known_affected","raw_product_name":"11.0(1b); 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13.1(2q); 13.1(2s); 13.1(2t)","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,"published_at":"2019-03-06T16:00:00Z","updated_at":"2019-03-06T16:00:00Z","advisory_updated_at":"2019-03-06T16:00:00Z","source_url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth","remediation":{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth"},"row_display_order":3}]}