Arista EOS up to 4.34.7.1M/4.35.5M/4.36.1F RADIUS Proxy Feature access control

Summaryinfo

A vulnerability described as problematic has been identified in Arista EOS up to 4.34.7.1M/4.35.5M/4.36.1F. This affects an unknown part of the component RADIUS Proxy Feature. Such manipulation leads to access control. This vulnerability is documented as CVE-2026-73449. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Arista EOS up to 4.34.7.1M/4.35.5M/4.36.1F. It has been rated as problematic. Affected by this issue is an unknown code block of the component RADIUS Proxy Feature. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at arista.com. This vulnerability is handled as CVE-2026-73449 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/15/2026). The MITRE ATT&CK project declares the attack technique as T1068.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Arista

Name

• EOS

Version

• 4.34.7.1M
• 4.35.5M
• 4.36.1F

License

• commercial

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