---
id: CVE-2026-73462
title: >-
  On affected platforms running Arista EOS with IGMP (Internet Group Management
  Protocol) snooping configured (enabled by default on all VLANs), a
  network-adjacent unauthenticated attacker can send malformed network packets
  on an affected …
summary: >-
  On affected platforms running Arista EOS with IGMP (Internet Group Management
  Protocol) snooping configured (enabled by default on all VLANs), a
  network-adjacent unauthenticated attacker can send malformed network packets
  on an affected …
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
vendor: Arista Networks
product: EOS
affected:
  - EOS >= 4.36.0 <= 4.36.1F
  - EOS >= 4.35.0 <= 4.35.5M
  - EOS >= 4.34.0 <= 4.34.7.1M
  - EOS >= 4.33.0 <= 4.33.8M
published: '2026-09-16'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T19:16:57.380'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73462'
references:
  - url: >-
      https://www.arista.com/en/support/advisories-notices/security-advisory/24715-security-advisory-0159
    label: psirt@arista.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T18:31:00.764860Z'
ingestedAt: '2026-09-16T20:03:30.756Z'
epss: 0.00281
epssPercentile: 0.18329
---

## Overview

On affected platforms running Arista EOS with IGMP (Internet Group Management Protocol) snooping configured (enabled by default on all VLANs), a network-adjacent unauthenticated attacker can send malformed network packets on an affected VLAN to cause the IGMP snooping agent to terminate unexpectedly. This results in a temporary disruption of multicast traffic management, which may cause multicast traffic to be flooded to all ports of the affected VLAN until the service recovers. Repeated exploitation could result in a prolonged loss of intended multicast forwarding behavior.

## Remediation

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