CVE-1999-0253: Microsoft Internet Information Server

High severity, CVSS 7.5. EPSS: 8% chance of exploitation in the next 30 days.

IIS 3.0 with the iis-fix hotfix installed allows remote intruders to read source code for ASP programs by using a %2e instead of a . (dot) in the URL.

Affected products

• Microsoft Internet Information Server: version 3.0 only
• Microsoft Internet Information Services: version 1.0 only; version 2.0 only

Published 1997-01-01. Last modified 2026-06-16.