What is CVE-2026-120980?

CVE-2026-120980 is a medium-severity vulnerability in Arista Networks Eos, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-11-10.

How severe is CVE-2026-120980?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-120980

On affected platforms running Arista EOS with VPLS-BGP enabled, an attacker who has established a BGP session with the PE routers can send a specially crafted BGP packet to cause the BGP agent to restart unexpectedly.

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

www.arista.com/en/support/advisories-notices/security-advisory/25036-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-120980?: CVE-2026-120980 is a medium-severity vulnerability in Arista Networks Eos, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2026-11-10.
How severe is CVE-2026-120980?: Medium severity. CVSS v3 base score is 5.3 out of 10.