CVE-1999-0721: Microsoft Windows 2000

High severity, CVSS 7.8. EPSS: 8.5% chance of exploitation in the next 30 days.

Denial of service in Windows NT Local Security Authority (LSA) through a malformed LSA request.

Affected products

• Microsoft Windows 2000: any version
• Microsoft Windows Nt: any version; version 4.0 only

Published 1999-07-20. Last modified 2026-06-16.