Windows NT 4.0 does not properly shut down invalid named pipe RPC connections, which allows remote attackers to cause a denial of service (resource exhaustion) via a series of connections containing malformed data, aka the "Named Pipes Over RPC" vulnerability.

References

• https://nvd.nist.gov/vuln/detail/CVE-1999-1127
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/1998/ms98-017
• http://support.microsoft.com/support/kb/articles/Q195/7/33.asp
• http://www.iss.net/security_center/static/523.php