---
id: CVE-2026-73436
title: >-
  On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment
  routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF
  neighbor may cause OSPF to restart unexpectedly.
summary: >-
  On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment
  routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF
  neighbor may cause OSPF to restart unexpectedly.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
  - CWE-1284
vendor: Arista Networks
product: EOS
affected:
  - EOS >= 4.36.0F <= 4.36.1F
  - EOS >= 4.35.0F <= 4.35.5M
  - EOS >= 4.34.0F <= 4.34.7.1M
  - EOS >= 4.33.0F <= 4.33.9M
  - EOS >= 1.0.0 < 4.33.0F
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:08:50.420'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73436'
references:
  - url: >-
      https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171
    label: psirt@arista.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-16T13:50:10.659104Z'
ingestedAt: '2026-09-16T09:53:11.603Z'
epss: 0.00269
epssPercentile: 0.16976
---

## Overview

On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.

## Remediation

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