---
id: CVE-2026-73444
title: >-
  On affected platforms running Arista EOS with VRRPv2 IP Authentication Header
  (IP-AH) authentication configured, an unauthenticated attacker with access to
  the layer 2 network segment on which VRRP is running could bypass VRRP
  authentica…
summary: >-
  On affected platforms running Arista EOS with VRRPv2 IP Authentication Header
  (IP-AH) authentication configured, an unauthenticated attacker with access to
  the layer 2 network segment on which VRRP is running could bypass VRRP
  authentica…
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-303
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
  - EOS all versions
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:17:31.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73444'
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: '2026-09-16T18:04:26.052032Z'
ingestedAt: '2026-09-15T21:44:50.658Z'
epss: 0.00299
epssPercentile: 0.20029
---

## Overview

On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the virtual router master role, enabling the attacker to intercept, modify, or discard traffic that hosts on the segment send to the virtual gateway address.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.