CVE-2010-2566: Microsoft Windows 2003 Server

High severity, CVSS 9.3. EPSS: 15.3% chance of exploitation in the next 30 days.

The Secure Channel (aka SChannel) security package in Microsoft Windows XP SP2 and SP3, and Windows Server 2003 SP2, does not properly validate certificate request messages from TLS and SSL servers, which allows remote servers to execute arbitrary code via a crafted SSL response, aka "SChannel Malformed Certificate Request Remote Code Execution Vulnerability."

Affected products

• Microsoft Windows 2003 Server: any version
• Microsoft Windows Server 2003: any version
• Microsoft Windows XP: any version; affected versions not specified

Published 2010-08-11. Last modified 2026-06-16.