CVE-2009-2510: Microsoft Windows 2000

Medium severity, CVSS 6.8. EPSS: 5.3% chance of exploitation in the next 30 days.

The CryptoAPI component in Microsoft Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7, as used by Internet Explorer and other applications, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, aka "Null Truncation in X.509 Common Name Vulnerability," a related issue to CVE-2009-2408.

Affected products

• Microsoft Windows 2000: any version
• Microsoft Windows 2003 Server: any version
• Microsoft Windows 7: affected versions not specified
• Microsoft Windows Server 2008: any version; affected versions not specified
• Microsoft Windows Vista: any version
• Microsoft Windows XP: any version; affected versions not specified

Published 2009-10-14. Last modified 2026-06-16.