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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2001-0006
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-003
• https://exchange.xforce.ibmcloud.com/vulnerabilities/6006
• http://marc.info/?l=bugtraq&m=98075221915234&w=2