---
id: "CVE-2026-120981"
page: "https://infrastack.ai/live/CVE-2026-120981"
kind: "vulnerability"
aliases: ["CVE-2026-120981"]
title: "Arista EOS: VPLS-BGP lets a BGP peer churn pseudowire routes"
severity: "medium"
cvss: 6.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["arista-eos", "bgp", "infrastructure", "network-operators", "vpls"]
not_affected_if: ["no-untrusted-bgp-peers", "vpls-bgp-disabled"]
published_at: "2026-11-10T20:18:53+00:00"
first_seen_at: "2026-11-10T20:46:03+00:00"
updated_at: "2026-11-10T20:48:10+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120981", "first_seen_at": "2026-11-10T20:46:03+00:00"}]
exploit_sources: []
---

# Arista EOS: VPLS-BGP lets a BGP peer churn pseudowire routes

Link for people: https://infrastack.ai/live/CVE-2026-120981 (this .md is for agents)

On Arista EOS routers with VPLS-BGP enabled, an attacker who has already set up a BGP session with the provider edge router can change route advertisements for VPLS pseudowires. This causes established routes to churn with other legitimate BGP peers.

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

## Timeline

- 2026-11-10T20:46:03+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120981

## From the sources

On affected platforms running Arista EOS with VPLS-BGP enabled, an attacker who has established a BGP session with the PE router can affect the route advertisements of VPLS pseudowires, causing a churn of the established routes with other legitimate BGP peers.

---

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