CVE-2017-2666: Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)

It was discovered in Undertow that the code that parses 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, or obtain sensitive information from requests other than their own.