CVE-2000-0408: Microsoft Internet Information Server

Medium severity, CVSS 5.0. EPSS: 58% chance of exploitation in the next 30 days.

IIS 4.05 and 5.0 allow remote attackers to cause a denial of service via a long, complex URL that appears to contain a large number of file extensions, aka the "Malformed Extension Data in URL" vulnerability.

Affected products

• Microsoft Internet Information Server: version 4.0 only
• Microsoft Internet Information Services: version 5.0 only

Published 2000-05-11. Last modified 2026-06-16.