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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

Quick assessment

Affected
Arista Networks EOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

一个经过认证的相邻网络上的请求方（supplicant），可能在身份验证阶段完成与其分配好的访问控制列表（ACL）完全生效之间的短暂时间窗口内（几毫秒到几秒），绕过预设的网络授权策略并发送不受限制的数据流量。

CVSS 2.6 · Low
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I. Basic Information for CVE-2026-77191

Vulnerability Information
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Vulnerability Title
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
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arista Networks EOS 4.35.0 ~ 4.35.0.3F -

II. Public POCs for CVE-2026-77191

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III. Intelligence Information for CVE-2026-77191

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Vendor Advisories for CVE-2026-77191 (1)

Same Patch Batch · Arista Networks · 2026-09-14 · 5 CVEs total

CVE-2026-73449 5.9 MEDIUM On affected platforms running Arista EOS with both 802.1X port authentication and the RADI
CVE-2026-75943 2.6 LOW A brief (milliseconds to seconds) traffic leak may occur when an authenticated supplicant
CVE-2026-75944 2.6 LOW A race condition during supplicant re-authentication may leave a stale ACL entry that pers
CVE-2026-75945 2.6 LOW A race condition may cause a supplicant to remain in an authorized state after a clear dot

IV. Related Vulnerabilities

Same product: EOS
Same vendor: Arista Networks
Same weakness: CWE-862

V. Comments for CVE-2026-77191

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