CVE-2000-0970: Microsoft Internet Information Server

High severity, CVSS 7.5. EPSS: 45.7% chance of exploitation in the next 30 days.

IIS 4.0 and 5.0 .ASP pages send the same Session ID cookie for secure and insecure web sessions, which could allow remote attackers to hijack the secure web session of the user if that user moves to an insecure session, aka the "Session ID Cookie Marking" vulnerability.

Affected products

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

Published 2000-12-19. Last modified 2026-09-23.