CVE-2026-73443

MediumCVSS 4.7/10Last modified Sep 17, 2026

Description

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.

Metrics

CVSS 3.1 4.7/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Weakness enumeration

CWE-294

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

No affected versions have been published.

Timeline

Published
Sep 16, 2026
Last modified
Sep 17, 2026
NVD status
Awaiting Analysis

Related CVEs from 2026

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CVE-2026-73443: Medium severity, CVSS 4.7 | Vulnix