{"id":"CVE-2026-73443","title":"On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement …","summary":"On affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement …","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","cwe":["CWE-294"],"vendor":"Arista Networks","product":"EOS","affected":["EOS >= 4.36.0 <= 4.36.1F","EOS >= 4.35.0 <= 4.35.5M","EOS >= 4.34.0 <= 4.34.7M","EOS >= 4.33.0 <= 4.33.9M"],"published":"2026-09-16","updated":"2026-09-17","sourceUpdated":"2026-09-17T19:16:57.003","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73443","references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24713-security-advisory-0157","label":"psirt@arista.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-17T18:33:08.446292Z"},"ingestedAt":"2026-09-16T19:02:30.725Z","epss":0.00273,"epssPercentile":0.19907,"slug":"CVE-2026-73443","body":"## Overview\n\nOn affected platforms running Arista EOS with VRRPv2 IP-AH authentication configured, an unauthenticated attacker within the same layer 2 network segment on which VRRP is running can capture a legitimate authenticated VRRP advertisement and replay it indefinitely. Replayed advertisements can be used to advertise stale VRRP state, for example to prevent a backup router from taking over the virtual gateway after the original master has gone down, resulting in a denial of service for hosts using the virtual gateway address.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}