CVE-2002-1256: Microsoft Windows 2000

Medium severity, CVSS 5.0. EPSS: 5.4% chance of exploitation in the next 30 days.

The SMB signing capability in the Server Message Block (SMB) protocol in Microsoft Windows 2000 and Windows XP allows attackers to disable the digital signing settings in an SMB session to force the data to be sent unsigned, then inject data into the session without detection, e.g. by modifying group policy information sent from a domain controller.

Affected products

• Microsoft Windows 2000: any version
• Microsoft Windows 2000 Terminal Services: any version
• Microsoft Windows XP: any version

Published 2002-12-23. Last modified 2026-06-16.