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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

Published: Sep 14, 2026Updated: Sep 14, 2026 Sources: CVE List NVDCWE-862
2.6LOW
NVD MITRE
EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:AAC:HPR:LUI:NS:UC:NI:LA:N
Exploitability
AV:AAttack Vector
Adjacent
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-862

Affected Products

Arista Networks
commercial·US
EOSOn-prem
Networking Infrastructure / router-switch

Exploitability

Official Patch Available
Workaround Available

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

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

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