CVE-2026-73449 — MEDIUM (5.9)

Vulnerability Description

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.

CVSS Score

5.9

MEDIUM

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L

Attack Vector

ADJACENT_NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

HIGH

Availability

LOW

Related Weaknesses (CWE)

CWE-290

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24705-sec

FAQ

What is CVE-2026-73449?

CVE-2026-73449 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 segme...

How severe is CVE-2026-73449?

CVE-2026-73449 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-73449?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.