CVE-2005-2089: Microsoft Internet Information Services

Medium severity, CVSS 4.3. EPSS: 31% chance of exploitation in the next 30 days.

Microsoft IIS 5.0 and 6.0 allows remote attackers to poison the web cache, bypass web application firewall protection, and conduct XSS attacks via an HTTP request with both a "Transfer-Encoding: chunked" header and a Content-Length header, which causes IIS to incorrectly handle and forward the body of the request in a way that causes the receiving server to process it as a separate HTTP request, aka "HTTP Request Smuggling."

Affected products

• Microsoft Internet Information Services: version 5.0 only; version 6.0 only

Published 2005-07-05. Last modified 2026-06-16.