Description
In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.
Remediation
References
Related Vulnerabilities
Moodle Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2011-4133)
MySQL CVE-2020-2814 Vulnerability (CVE-2020-2814)
WordPress Plugin AVH Extended Categories Widgets SQL Injection (4.0.0)
WordPress Plugin WPtouch Cross-Site Scripting (3.7.5.3)
Liferay DXP Cleartext Storage of Sensitive Information Vulnerability (CVE-2025-62261)