CVE-1999-0581: Microsoft Windows Nt

High severity, CVSS 10.0. EPSS: 6.7% chance of exploitation in the next 30 days.

The HKEY_CLASSES_ROOT key in a Windows NT system has inappropriate, system-critical permissions.

Affected products

• Microsoft Windows Nt: any version

Published 1999-01-01. Last modified 2026-06-16.