← CVE Intelligence

CVE-2026-73443

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 and replay it indef PUBLISHED

Description (CNA)

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 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.

Affected (CNA)

Vendor / productVersions
Arista Networks / EOSaffected 4.36.0 through 4.36.1F; affected 4.35.0 through 4.35.5M; affected 4.34.0 through 4.34.7M; affected 4.33.0 through 4.33.9M

CWE

CWE-294

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.