CVE-2006-3440: Microsoft Windows 2000

High severity, CVSS 10.0. EPSS: 57.3% chance of exploitation in the next 30 days.

Buffer overflow in the Winsock API in Microsoft Windows 2000 SP4, XP SP1 and SP2, and Server 2003 SP1 allows remote attackers to execute arbitrary code via unknown vectors, aka "Winsock Hostname Vulnerability."

Affected products

• Microsoft Windows 2000: any version
• Microsoft Windows 2003 Server: version 64-bit only; version sp1 only
• Microsoft Windows XP: any version

Published 2006-08-09. Last modified 2026-06-16.