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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

🗓️ 14 Sep 2026 22:06:28Reported by AristaType 
cvelist
 cvelist
🔗 www.cve.org👁 28 Views

ACL bypass in Arista EOS 802.1X lets authenticated supplicant send unrestricted traffic briefly.

Related
Affected
Refs
[
  {
    "vendor": "Arista Networks",
    "product": "EOS",
    "versions": [
      {
        "status": "affected",
        "version": "4.35.0",
        "lessThanOrEqual": "4.35.0.3F",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.34.0",
        "lessThanOrEqual": "4.34.5M",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "0.0.0",
        "lessThanOrEqual": "4.33.7.1M",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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14 Sep 2026 22:06Current
CVSS 42.1
CVSS 3.12.6
EPSS0.0014
28