CVE-1999-0995: Microsoft Windows Nt

High severity, CVSS 7.8. EPSS: 21.8% chance of exploitation in the next 30 days.

Windows NT Local Security Authority (LSA) allows remote attackers to cause a denial of service via malformed arguments to the LsaLookupSids function which looks up the SID, aka "Malformed Security Identifier Request."

Affected products

• Microsoft Windows Nt: version 4.0 only

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