{"id":"CVE-2019-1594","published":"2019-03-06T22:00:00Z","modified":"2024-11-21T19:44:08Z","title":"Cisco NX-OS Software 802.1X Extensible Authentication Protocol over LAN Denial of Service Vulnerability","vendor":"Cisco","product":"Nexus 1000V Switch for VMware vSphere","tier":"core","eol":null,"affectedVersions":[{"vendor":"Cisco","product":"Nexus 1000V Switch for VMware vSphere","versions":[">= unspecified, < 5.2(1)SV3(1.4b)"]},{"vendor":"Cisco","product":"Nexus 3000 Series Switches","versions":[">= unspecified, < 7.0(3)I7(4)"]},{"vendor":"Cisco","product":"Nexus 3500 Platform Switches","versions":[">= unspecified, < 7.0(3)I7(4)"]},{"vendor":"Cisco","product":"Nexus 2000, 5500, 5600, and 6000 Series Switches","versions":[">= unspecified, < 7.3(5)N1(1)",">= unspecified, < 7.1(5)N1(1b)"]},{"vendor":"Cisco","product":"Nexus 7000 and 7700 Series Switches","versions":[">= unspecified, < 8.2(3)"]},{"vendor":"Cisco","product":"Nexus 9000 Series Fabric Switches in ACI Mode","versions":[">= unspecified, < 13.2(1l)"]},{"vendor":"Cisco","product":"Nexus 9000 Series Switches in Standalone NX-OS Mode","versions":[">= unspecified, < 7.0(3)I7(4)"]}],"description":{"text":"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 Nexus 1000V Switch for VMware vSphere devices are affected in versions prior to 5.2(1)SV3(1.4b). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I7(4). Nexus 3500 Platform Switches are affected in versions prior to 7.0(3)I7(4). Nexus 2000, 5500, 5600, and 6000 Series Switches are affected in versions prior to 7.3(5)N1(1) and 7.1(5)N1(1b). Nexus 7000 and 7700 Series Switches are affected in versions prior to 8.2(3). Nexus 9000 Series Fabric Switches in ACI Mode are affected in versions prior to 13.2(1l). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected in versions prior to 7.0(3)I7(4).","provenance":"source","from":"CVE.org"},"summary":null,"cvss":{"score":7.4,"severity":"HIGH","version":"3.0","vector":"CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00805,"percentile":0.56622,"date":"2026-10-28","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":3,"pulses":[{"name":"Spam “Broken Seal” DocuSign-themed Delivery w/Fileless Process Hollowing (Zeppelin/Bloat-A) by msudosos","url":"https://otx.alienvault.com/pulse/69bf64eccb5d39a90a3c391e","created":"2026-03-22"},{"name":"Spam “Broken Seal” DocuSign-themed Delivery w/Fileless Process Hollowing (Zeppelin/Bloat-A) by msudosos","url":"https://otx.alienvault.com/pulse/69bf64e1d5e06aa6207f78de","created":"2026-03-22"},{"name":"“Broken Seal” DocuSign-themed Delivery with Fileless Process Hollowing (Zeppelin/Bloat-A)","url":"https://otx.alienvault.com/pulse/698e93e1ab02db8c49e8c3ed","created":"2026-02-13"}],"provenance":"machine"},"cwes":[{"id":"CWE-264","name":null}],"references":[{"url":"http://www.securityfocus.com/bid/107325","tags":["vdb-entry","x_refsource_BID"]},{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nx-os-lan-auth","tags":["vendor-advisory","x_refsource_CISCO"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 2)","mappingType":"exploitation_technique","evidence":[],"confidence":"high"},{"id":"T1499.004","name":"Application or System Exploitation","tactics":["impact"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 2)","mappingType":"primary_impact","evidence":[],"confidence":"high"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2019-10151","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-10151","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"source"},{"stage":"primary","techniques":["T1499.004"],"provenance":"source"}],"timeline":[{"date":"2019-03-06","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2019-1594","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":17.9,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":11.32,"detail":"percentile 0.5662"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":1.37,"detail":"3 pulses"},{"name":"CVSS severity","points":5.18,"detail":"base score 7.4"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}