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CVE-2026-77191

EOS · Vulnerability

CVSS 3.1 2.6 LOWCVSS 4.0 2.1 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-77191

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-77191

Published

EOS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Arista Networks",
                    "product": "EOS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "4.35.0",
                            "lessThanOrEqual": "4.35.0.3F",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.34.0",
                            "lessThanOrEqual": "4.34.5M",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "0.0.0",
                            "lessThanOrEqual": "4.33.7.1M",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON