What is CVE-2026-121371?

CVE-2026-121371 is a high-severity vulnerability in Arista Networks Eos, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-11-10.

How severe is CVE-2026-121371?

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

Path Traversal in Arista Networks Eos

CVE-2026-121371

On affected EOS versions with the eAPI service enabled, a specially crafted HTTP request can allow an unauthenticated, remote attacker to read arbitrary files, including sensitive credentials from the switch filesystem.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-11-10 · last modified 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:H/I:N/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-22 — Path Traversal

References

www.arista.com/en/support/advisories-notices/security-advisory/25040-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-121371?: CVE-2026-121371 is a high-severity vulnerability in Arista Networks Eos, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-11-10.
How severe is CVE-2026-121371?: High severity. CVSS v3 base score is 7.5 out of 10.