CVE-2011-0040: Microsoft Windows 2003 Server

Medium severity, CVSS 5.0. EPSS: 22.8% chance of exploitation in the next 30 days.

The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka "Active Directory SPN Validation Vulnerability."

Affected products

• Microsoft Windows 2003 Server: any version

Published 2011-02-09. Last modified 2026-06-16.