CVE-1999-0874: Microsoft Internet Information Server

High severity, CVSS 10.0. EPSS: 74.7% chance of exploitation in the next 30 days.

Buffer overflow in IIS 4.0 allows remote attackers to cause a denial of service via a malformed request for files with .HTR, .IDC, or .STM extensions.

Affected products

• Microsoft Internet Information Server: version 4.0 only
• Microsoft Windows 2000: any version
• Microsoft Windows Nt: any version; version 4.0 only

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