CVE-2026-75943— A brief (milliseconds to seconds) traffic leak may occur when an authenticated supplicant is removed, either via the clear dot1x host all CLI command or due to a supplicant timeout. During this window, the supplicant's traffic may pass without ACL enforcem
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.
当已认证的 supplicant（申请者/客户端）被移除时（通过 CLI 命令或因 supplicant 超时），可能会出现短暂的（毫秒到秒级）流量泄露。在此时间窗口内，该 supplicant 的流量可能在未执行 ACL（访问控制列表）强制检查的情况下通过。
Possible ATT&CK Techniques 1 AI
T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-75943
Vulnerability Information
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Vulnerability Title
A brief (milliseconds to seconds) traffic leak may occur when an authenticated supplicant is removed, either via the clear dot1x host all CLI command or due to a supplicant timeout. During this window, the supplicant's traffic may pass without ACL enforcem
Source: CVE Program / CVE List V5
Vulnerability Description
A brief (milliseconds to seconds) traffic leak may occur when an authenticated supplicant is removed, either via the clear dot1x host all CLI command or due to a supplicant timeout. During this window, the supplicant's traffic may pass without ACL enforcement.
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
清理环节不完整
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Arista Networks | EOS | 4.36.0 ~ 4.36.1F | - |
|
II. Public POCs for CVE-2026-75943
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-75943 (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-2026-75944 | 2.6 LOW | A race condition during supplicant re-authentication may leave a stale ACL entry that pers |
| CVE-2026-77191 | 2.6 LOW | All of the CVEs covered in this advisory apply to affected platforms running Arista EOS wi |
| 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
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CVE-2026-75945
A race condition may cause a supplicant to remain in an auth -
CVE-2026-75944
A race condition during supplicant re-authentication may lea -
CVE-2026-77191
All of the CVEs covered in this advisory apply to affected p -
CVE-2026-73449
On affected platforms running Arista EOS with both 802.1X po -
CVE-2026-2379
Arista EOS IPsec Tunnel Sequence Number Mismatch via Interfa
Same vendor: Arista Networks
-
CVE-2026-75945
A race condition may cause a supplicant to remain in an auth -
CVE-2026-75944
A race condition during supplicant re-authentication may lea -
CVE-2026-77191
All of the CVEs covered in this advisory apply to affected p -
CVE-2026-73449
On affected platforms running Arista EOS with both 802.1X po -
CVE-2026-17191
VeloCloud Orchestrator Flow Metrics API SQL Injection
V. Comments for CVE-2026-75943
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