---
title: "CVE-2026-73453: Arista EOS - Remote Code Execution"
description: "Arista EOS contains a remote code execution caused by crafted malicious packets during P4Runtime session initiation, letting unauthenticated attackers gain complete administrative control, exploit requires P4Runtime enabled and network access."
url: https://panop.io/threat-heartbeat/CVE-2026-73453/
---

# CVE-2026-73453 Arista EOS - Remote Code Execution

Arista EOS contains a remote code execution caused by crafted malicious packets during P4Runtime session initiation, letting unauthenticated attackers gain complete administrative control, exploit requires P4Runtime enabled and network access.

CVSS base score 10.0 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.69% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-73453)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution, Privilege Escalation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-94](https://cwe.mitre.org/data/definitions/94.html)

## Vendor fix

Disable P4Runtime if not needed or update to the latest Arista EOS version with the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-73453](https://nvd.nist.gov/vuln/detail/CVE-2026-73453)
- [https://www.arista.com/en/support/advisories-notices/security-advisory/24730-security-advisory-0174](https://www.arista.com/en/support/advisories-notices/security-advisory/24730-security-advisory-0174)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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