CVE-2026-77191All 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
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 2.6 LOW (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Arista
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Arista Networks EOS arista_networks:eos (from the name) | from 4.35.0 through 4.35.0.3F; from 4.34.0 through 4.34.5M; from 0.0.0 through 4.33.7.1M | CNA record |
References
- https://www.arista.com/en/support/advisories-notices/security-advisory/24706-security-advisory-0150
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.