CVE-2001-0347: Microsoft Windows 2000

High severity, CVSS 7.5. EPSS: 13.8% chance of exploitation in the next 30 days.

Information disclosure vulnerability in Microsoft Windows 2000 telnet service allows remote attackers to determine the existence of user accounts such as Guest, or log in to the server without specifying the domain name, via a malformed userid.

Affected products

• Microsoft Windows 2000: any version

Published 2001-07-21. Last modified 2026-06-16.