CVE-2005-3173: Microsoft Windows 2000

Medium severity, CVSS 4.6. EPSS: 1.3% chance of exploitation in the next 30 days.

Microsoft Windows 2000 before Update Rollup 1 for SP4 does not apply group policies if the user logs on using UPN credentials with a trailing dot, which prevents Windows 2000 from finding the correct domain controller and could allow the user to bypass intended restrictions.

Affected products

• Microsoft Windows 2000: any version

Published 2005-10-06. Last modified 2026-06-16.