CVE-2009-2057: Microsoft Ie

Medium severity, CVSS 5.8. EPSS: 3% chance of exploitation in the next 30 days.

Microsoft Internet Explorer before 8 uses the HTTP Host header to determine the context of a document provided in a (1) 4xx or (2) 5xx CONNECT response from a proxy server, which allows man-in-the-middle attackers to execute arbitrary web script by modifying this CONNECT response, aka an "SSL tampering" attack.

Affected products

• Microsoft Ie: version 5.0 only; version 5.22 only; version 6.0 only
• Microsoft Internet Explorer: version 3.0 only; version 3.0.1 only; version 3.0.2 only; version 3.1 only; version 3.2 only; version 4.0 only; …

Published 2009-06-15. Last modified 2026-06-16.