CVE-2001-0909: Microsoft Windows XP

High severity, CVSS 7.5. EPSS: 19.7% chance of exploitation in the next 30 days.

Buffer overflow in helpctr.exe program in Microsoft Help Center for Windows XP allows remote attackers to execute arbitrary code via a long hcp: URL.

Affected products

• Microsoft Windows XP: any version

Published 2001-11-21. Last modified 2026-06-16.