What is CVE-2026-121295?

CVE-2026-121295 is a high-severity vulnerability in Arista Networks Eos, classified under Improper Validation of Specified Quantity in Input. CVSS score: 8.6/10. Published 2026-11-10.

How severe is CVE-2026-121295?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-121295

On affected platforms running Arista EOS configured as S-BFD peers, an unauthenticated attacker could send a crafted S-BFD PDU to an initiator device. This crafted PDU could cause the kernel on the initiator device to crash, resulting in an unexpected device reboot.

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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-1284 — Improper Validation of Specified Quantity in Input

References

www.arista.com/en/support/advisories-notices/security-advisory/25045-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-121295?: CVE-2026-121295 is a high-severity vulnerability in Arista Networks Eos, classified under Improper Validation of Specified Quantity in Input. CVSS score: 8.6/10. Published 2026-11-10.
How severe is CVE-2026-121295?: High severity. CVSS v3 base score is 8.6 out of 10.