---
id: CVE-2026-73453
title: >-
  An unauthenticated P4Runtime (Programming Protocol-Independent Packet
  Processors Runtime) client can achieve arbitrary code execution under certain
  conditions on affected platforms running Arista EOS configured with P4Runtime
summary: >-
  An unauthenticated P4Runtime (Programming Protocol-Independent Packet
  Processors Runtime) client can achieve arbitrary code execution under certain
  conditions on affected platforms running Arista EOS configured with P4Runtime.
  P4Runtime …
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: Arista Networks
product: EOS
affected:
  - EOS >= 4.36.0F <= 4.36.1F
  - EOS >= 4.35.0F <= 4.35.5M
  - EOS >= 4.34.0F <= 4.34.7M
  - EOS >= 4.33.0F < 4.34.0F
  - EOS >= 4.32.0F < 4.33.0F
  - EOS >= 4.31.0F < 4.32.0F
  - EOS >= 4.30.0F < 4.31.0F
  - EOS >= 4.29.2F < 4.30.0F
published: '2026-09-16'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T04:17:59.823'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73453'
references:
  - url: >-
      https://www.arista.com/en/support/advisories-notices/security-advisory/24730-security-advisory-0174
    label: psirt@arista.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-16T13:41:50.538373Z'
epss: 0.00695
epssPercentile: 0.50953
ingestedAt: '2026-09-16T09:53:11.605Z'
---

## Overview

An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under certain conditions on affected platforms running Arista EOS configured with P4Runtime. P4Runtime is disabled by default in Arista EOS. By crafting a malicious packet during the initiation of a P4Runtime session, an attacker can obtain complete administrative control over the compromised switch.

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.