CVE-2001-0006: Microsoft Windows Nt

High severity, CVSS 7.1. EPSS: 3% chance of exploitation in the next 30 days.

The Winsock2ProtocolCatalogMutex mutex in Windows NT 4.0 has inappropriate Everyone/Full Control permissions, which allows local users to modify the permissions to "No Access" and disable Winsock network connectivity to cause a denial of service, aka the "Winsock Mutex" vulnerability.

Affected products

• Microsoft Windows Nt: version 4.0 only

Published 2001-02-12. Last modified 2026-06-16.