EOS · Vulnerability
cve-program · CVE-2026-73443
PublishedOn 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.
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CVE-2026-73443 · CVE overview and exploitation status
cve-program · CVE-2026-73443
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