CVE-1999-1538: Microsoft Internet Information Server

Low severity, CVSS 2.1. EPSS: 25.3% chance of exploitation in the next 30 days.

When IIS 2 or 3 is upgraded to IIS 4, ism.dll is inadvertently left in /scripts/iisadmin, which does not restrict access to the local machine and allows an unauthorized user to gain access to sensitive server information, including the Administrator's password.

Affected products

• Microsoft Internet Information Server: version 4.0 only

Published 1999-01-14. Last modified 2026-06-16.