Improper Input Validation
Improper Input Validation vulnerability in Apache Tomcat. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. This issue affects Apache Tomcat versions 8.5.0 through 8.5.93, 9.0.0.M1 through 9.0.80, 10.1.0-M1 through 10.1.13, and 11.0.0-M1 through 11.0.0-M11.
CWE-20 - Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.