CVE-2001-0721: Microsoft Windows 98

Medium severity, CVSS 5.0. EPSS: 17.3% chance of exploitation in the next 30 days.

Universal Plug and Play (UPnP) in Windows 98, 98SE, ME, and XP allows remote attackers to cause a denial of service (memory consumption or crash) via a malformed UPnP request.

Affected products

• Microsoft Windows 98: any version
• Microsoft Windows 98se: any version
• Microsoft Windows Me: any version
• Microsoft Windows XP: any version

Published 2001-12-06. Last modified 2026-06-16.