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CVE-2026-73449

EOS · Vulnerability

CVSS 3.1 5.9 MEDIUMCVSS 4.0 5.9 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-73449

Published

On affected platforms running Arista EOS with both 802.1X port authentication and the RADIUS proxy feature configured with dynamic authorization, a low-privileged attacker on an adjacent network segment who induces a RADIUS packet through a configured RADIUS proxy client can prevent RADIUS dynamic authorization messages, including Change-of-Authorization (CoA) and Disconnect-Requests as defined in RFC 5176, from being applied to locally authenticated 802.1X sessions. This allows an endpoint session that a RADIUS server or network access control system has ordered disconnected to remain authorized on the network. Both 802.1X port authentication with dynamic authorization and RADIUS proxy with dynamic authorization must be explicitly configured for a deployment to be exposed to this issue. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-73449

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": "4.36.0",
                            "lessThanOrEqual": "4.36.1F",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.35.0",
                            "lessThanOrEqual": "4.35.5M",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.34.0",
                            "lessThanOrEqual": "4.34.7.1M",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

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