CVE-2009-2069: Microsoft Ie

Medium severity, CVSS 5.8. EPSS: 2.2% chance of exploitation in the next 30 days.

Microsoft Internet Explorer before 8 displays a cached certificate for a (1) 4xx or (2) 5xx CONNECT response page returned by a proxy server, which allows man-in-the-middle attackers to spoof an arbitrary https site by letting a browser obtain a valid certificate from this site during one request, and then sending the browser a crafted 502 response page upon a subsequent request.

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.