What is CVE-2026-120979?

CVE-2026-120979 is a high-severity vulnerability in Arista Networks Eos, classified under CWE-1289. CVSS score: 8.1/10. Published 2026-11-10.

How severe is CVE-2026-120979?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-120979

This vulnerability affects customers using Arista Pathfinder for WAN path selection with Border Gateway Protocol-Link State (BGP-LS) configured for Dynamic Path Selection (DPS). On affected platforms running Arista EOS with BGP-LS configured for DPS, an attacker who has established an authenticated BGP-LS session with the device can send a specially crafted BGP packet to cause incorrect WAN path selection and disrupt traffic forwarding.

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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-1289

References

www.arista.com/en/support/advisories-notices/security-advisory/25034-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-120979?: CVE-2026-120979 is a high-severity vulnerability in Arista Networks Eos, classified under CWE-1289. CVSS score: 8.1/10. Published 2026-11-10.
How severe is CVE-2026-120979?: High severity. CVSS v3 base score is 8.1 out of 10.