SAP Web Application Server (WebAS) Kernel before 7.0 allows remote attackers to inject arbitrary bytes into the HTTP response and obtain sensitive authentication information, or have other impacts, via a ";%20" followed by encoded HTTP headers.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25003
http://www.vupen.com/english/advisories/2006/0810
http://www.securityfocus.com/bid/18006
http://www.securityfocus.com/archive/1/426449/100/0/threaded