---
id: CVE-2026-19655
title: >-
  On affected platforms running Arista EOS with Dynamic Host Configuration
  Protocol (DHCP) relay/snooping configured with the information option (Option
  82), or with the DHCP server configured with match criteria based on the
  information o…
summary: >-
  On affected platforms running Arista EOS with Dynamic Host Configuration
  Protocol (DHCP) relay/snooping configured with the information option (Option
  82), or with the DHCP server configured with match criteria based on the
  information o…
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-20
vendor: Arista Networks
product: EOS
affected:
  - EOS >= 4.35.0 <= 4.35.5M
  - EOS >= 4.34.0 <= 4.34.7.1M
  - EOS >= 4.33.0 <= 4.33.9M
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:17:10.360'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19655'
references:
  - url: >-
      https://www.arista.com/en/support/advisories-notices/security-advisory/24711-security-advisory-0155
    label: psirt@arista.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-16T18:02:48.292435Z'
ingestedAt: '2026-09-15T21:44:50.634Z'
epss: 0.00194
epssPercentile: 0.08039
---

## Overview

On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.

## Remediation

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