---
id: "CVE-2026-120975"
page: "https://infrastack.ai/live/CVE-2026-120975"
kind: "vulnerability"
aliases: ["CVE-2026-120975"]
title: "Arista EOS: malicious packet can stop automatic certificate renewal"
severity: "low"
cvss: 3.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Arista EOS", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["arista-eos", "infrastructure", "network-gear", "tls-certificates"]
not_affected_if: ["feature-disabled", "manual-certificate-management"]
published_at: "2026-11-10T20:18:52+00:00"
first_seen_at: "2026-11-10T20:46:02+00:00"
updated_at: "2026-11-10T20:49:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120975", "first_seen_at": "2026-11-10T20:46:02+00:00"}]
exploit_sources: []
---

# Arista EOS: malicious packet can stop automatic certificate renewal

Link for people: https://infrastack.ai/live/CVE-2026-120975 (this .md is for agents)

On Arista EOS switches with automatic certificate management and automatic CA certificate retrieval enabled, a malicious packet can crash the AutoCertMgmt process. Managed X.509 certificates then stop renewing and may expire, breaking TLS-dependent services.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Arista EOS affected range not listed fixed no fixed version listed

## How to check

- Check whether automatic certificate management (AutoCertMgmt) is configured and whether automatic CA certificate retrieval is enabled on the switch
- Compare the running EOS version against the affected ranges in the Arista advisory: unknown

## Timeline

- 2026-11-10T20:46:02+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120975

## From the sources

On affected platforms running Arista EOS with automatic certificate management configured and automatic Certificate Authority (CA) certificate retrieval enabled, a malicious packet may cause the AutoCertMgmt process to be terminated unexpectedly. Managed X.509 certificates will not be renewed automatically and may eventually expire, potentially disrupting TLS-dependent services.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_