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.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6006
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-003