# CVE-2026-77191

## Summary

- **CVE ID:** CVE-2026-77191
- **Severity:** LOW
- **CVSS Score:** 2.6 (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)
- **CWE:** CWE-862
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- Arista Networks — EOS (4.35.0)
- Arista Networks — EOS (4.34.0)
- Arista Networks — EOS (0.0.0)

## References

- [CNA](https://www.arista.com/en/support/advisories-notices/security-advisory/24706-security-advisory-0150)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._