CVE-1999-0224: Microsoft Windows Nt

Medium severity, CVSS 5.0. EPSS: 16.8% chance of exploitation in the next 30 days.

Denial of service in Windows NT messenger service through a long username.

Affected products

• Microsoft Windows Nt: version 4.0 only

Published 1999-07-23. Last modified 2026-06-16.