What is CVE-2026-121369?

CVE-2026-121369 is a medium-severity vulnerability in Arista Networks Eos, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-11-10.

How severe is CVE-2026-121369?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Arista Networks Eos

CVE-2026-121369

On affected platforms running Arista EOS under specific link configurations an attacker with direct connectivity to the system may cause system CPU and memory utilization to increase considerably leading to slow responsiveness and eventually may cause the system to reboot.

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:P/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-770 — Allocation of Resources Without Limits or Throttling

References

www.arista.com/en/support/advisories-notices/security-advisory/25047-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-121369?: CVE-2026-121369 is a medium-severity vulnerability in Arista Networks Eos, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-11-10.
How severe is CVE-2026-121369?: Medium severity. CVSS v3 base score is 5.3 out of 10.