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

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...