CVE-1999-0867: Microsoft Commercial Internet System

Medium severity, CVSS 5.0. EPSS: 21.5% chance of exploitation in the next 30 days.

Denial of service in IIS 4.0 via a flood of HTTP requests with malformed headers.

Affected products

• Microsoft Commercial Internet System: version 2.0 only; version 2.5 only
• Microsoft Internet Information Server: version 4.0 only
• Microsoft Site Server: version 3.0 only

Published 1999-08-11. Last modified 2026-06-16.