CVE-1999-1127: Microsoft Windows Nt

High severity, CVSS 7.5. EPSS: 17.7% chance of exploitation in the next 30 days.

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.

Affected products

• Microsoft Windows Nt: version 4.0 only

Published 1999-12-31. Last modified 2026-06-16.