What is CVE-2026-120983?

CVE-2026-120983 is a high-severity vulnerability in Arista Networks Eos, classified under Improper Access Control. CVSS score: 7.6/10. Published 2026-11-10.

How severe is CVE-2026-120983?

High severity. CVSS v3 base score is 7.6 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-120983

On affected EOS platforms where 802.1x is configured in multi-host authenticated mode and the device is configured with Policy Based Routing (PBR), traffic from unauthenticated hosts may be forwarded to the destination configured in the PBR policies. This could potentially allow unauthenticated hosts access to networks. Additionally Layer 2 and Layer 3 control packets from unauthenticated hosts may get copied to the CPU.

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L.

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-284 — Improper Access Control

References

www.arista.com/en/support/advisories-notices/security-advisory/25037-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-120983?: CVE-2026-120983 is a high-severity vulnerability in Arista Networks Eos, classified under Improper Access Control. CVSS score: 7.6/10. Published 2026-11-10.
How severe is CVE-2026-120983?: High severity. CVSS v3 base score is 7.6 out of 10.