CVE-2026-77191

All of the CVEs covered in this advisory apply to affected platforms running Arista EOS with 802.1X authentication and authorization enabled and Access Control Lists (ACLs) configured for per-supplicant policy enforcement. An authenticated supplicant on an

State: Published
Severity: 2.1 Low
Published: Sep 14, 2026
Updated: Sep 15, 2026
Reserved: Aug 20, 2026

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Description

An authenticated supplicant on an adjacent network may bypass intended network authorization policy and send unrestricted traffic during a brief window (milliseconds to seconds) between the completion of the authentication phase and the full enforcement of its assigned ACL.

Scores

CVSS	Score	Vector	Source
4.0	2.1 Low	CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N	Arista
3.1	2.6 Low	CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N	Arista

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
EOSArista Networks	4.35.0 through 4.35.0.3FAffected 4.34.0 through 4.34.5MAffected 0.0.0 through 4.33.7.1MAffected

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24706-security-advisory-0150

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