Apache Tomcat Improper Input Validation Vulnerability - CVE-2016-6816

The code in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 8.5.0 to 8.5.6 8.0.0.RC1 to 8.0.38 7.0.0 to 7.0.72 and 6.0.0 to 6.0.47 that parsed the HTTP request line permitted invalid characters. This could be exploited in conjunction with a proxy that also permitted the invalid characters but with a different interpretation to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache perform an XSS attack and/or obtain sensitive information from requests other then their own.