CVE-2004-0123: Microsoft Windows 2000

High severity, CVSS 7.5. EPSS: 29.7% chance of exploitation in the next 30 days.

Double free vulnerability in the ASN.1 library as used in Windows NT 4.0, Windows 2000, Windows XP, and Windows Server 2003, allows remote attackers to cause a denial of service and possibly execute arbitrary code.

Affected products

• Microsoft Windows 2000: any version
• Microsoft Windows 2003 Server: version r2 only
• Microsoft Windows 98: any version
• Microsoft Windows 98se: any version
• Microsoft Windows Me: any version
• Microsoft Windows Nt: version 4.0 only
• Microsoft Windows XP: any version

Published 2004-06-01. Last modified 2026-06-16.