What is CVE-2026-120982?

CVE-2026-120982 is a high-severity vulnerability in Arista Networks Eos, classified under Expected Behavior Violation. CVSS score: 7.5/10. Published 2026-11-10.

How severe is CVE-2026-120982?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-120982

On affected platforms running Arista EOS with Border Gateway Protocol (BGP) configured, An unauthenticated attacker who can establish a BGP peering session with an affected device and can send specially crafted BGP messages to cause repeated BGP session resets, enabling sustained disruption to network routing and traffic forwarding.

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/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-440 — Expected Behavior Violation

References

www.arista.com/en/support/advisories-notices/security-advisory/25029-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-120982?: CVE-2026-120982 is a high-severity vulnerability in Arista Networks Eos, classified under Expected Behavior Violation. CVSS score: 7.5/10. Published 2026-11-10.
How severe is CVE-2026-120982?: High severity. CVSS v3 base score is 7.5 out of 10.