CVE-2009-0086: Microsoft Windows 2000

High severity, CVSS 10.0. EPSS: 14.2% chance of exploitation in the next 30 days.

Integer underflow in Windows HTTP Services (aka WinHTTP) in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, and Server 2008 allows remote HTTP servers to execute arbitrary code via crafted parameter values in a response, related to error handling, aka "Windows HTTP Services Integer Underflow Vulnerability."

Affected products

• Microsoft Windows 2000: any version
• Microsoft Windows Server 2003: any version
• Microsoft Windows Server 2008: any version
• Microsoft Windows Vista: any version; version gold only
• Microsoft Windows XP: any version

Published 2009-04-15. Last modified 2026-06-16.