---
id: CVE-2026-73451
title: >-
  On affected platforms running Arista EOS with dual switch cards and with
  ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in
  shared mode, restarting of the secondary switchcard forwarding agent or
  insertion of second…
summary: >-
  On affected platforms running Arista EOS with dual switch cards and with
  ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in
  shared mode, restarting of the secondary switchcard forwarding agent or
  insertion of second…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-1419
vendor: Arista Networks
product: EOS
affected:
  - EOS >= 4.36.0 <= 4.36.0.1F
  - EOS >= 4.35.0 <= 4.35.4M
  - EOS >= 4.34.0 <= 4.34.6M
  - EOS >= 4.33.0 <= 4.33.8M
  - EOS >= 4.32.0 <= 4.32.11M
  - EOS >= 4.31.1F <= 4.31.10M
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:08:50.420'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73451'
references:
  - url: >-
      https://www.arista.com/en/support/advisories-notices/security-advisory/24707-security-advisory-0151
    label: psirt@arista.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T19:24:36.704643Z'
ingestedAt: '2026-09-15T18:41:59.182Z'
epss: 0.00229
epssPercentile: 0.12205
---

## Overview

On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior.

This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.

## Remediation

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