CVE-2026-77191

published 2026-09-14

CVE-2026-77191: An authenticated supplicant on an adjacent network may bypass intended network authorization policy and send unrestricted traffic during a brief window…

Priority P4 13 low 2.6 CVSS 3.1

AV A AC H PR L UI N S U C N I L A N

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
arista_networks	eos	0.0.0 – 4.33.7.1M	—
arista_networks	eos	4.34.0 – 4.34.5M	—
arista_networks	eos	4.35.0 – 4.35.0.3F	—

CVSS provenance

nvd v3.1 2.6 LOW CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

nvd v4.0 2.1 LOW CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CWE-862