CVE-2001-0335: Microsoft Internet Information Server

Medium severity, CVSS 5.0. EPSS: 21% chance of exploitation in the next 30 days.

FTP service in IIS 5.0 and earlier allows remote attackers to enumerate Guest accounts in trusted domains by preceding the username with a special sequence of characters.

Affected products

• Microsoft Internet Information Server: up to and including 5.0

Published 2001-06-27. Last modified 2026-06-16.