What is CVE-2026-120977?

CVE-2026-120977 is a high-severity vulnerability in Arista Networks Eos, classified under CWE-807. CVSS score: 8.2/10. Published 2026-11-10.

How severe is CVE-2026-120977?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-120977

On affected platforms running Arista EOS with 802.1X with Dynamic Host Configuration Protocol (DHCP) device profiling enabled, a network-adjacent attacker can send a crafted DHCP packet to force the device to record a spoofed device profile. This may potentially allow the authenticated supplicant to acquire unauthorized access to a network segment with elevated privileges.

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N.

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-807

References

www.arista.com/en/support/advisories-notices/security-advisory/25039-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-120977?: CVE-2026-120977 is a high-severity vulnerability in Arista Networks Eos, classified under CWE-807. CVSS score: 8.2/10. Published 2026-11-10.
How severe is CVE-2026-120977?: High severity. CVSS v3 base score is 8.2 out of 10.