java/org/apache/coyote/ajp/AbstractAjpProcessor.java in Apache Tomcat 8.x before 8.0.4 allows remote attackers to cause a denial of service (thread consumption) by using a "Content-Length: 0" AJP request to trigger a hang in request processing.
http://www.securitytracker.com/id/1030300
http://www.securityfocus.com/bid/67673
http://www.oracle.com/technetwork/topics/security/cpuoct2014-1972960.html
http://www-01.ibm.com/support/docview.wss?uid=swg21681528
http://www-01.ibm.com/support/docview.wss?uid=swg21678231
http://tomcat.apache.org/security-8.html
http://svn.apache.org/viewvc?view=revision&revision=1578392
http://secunia.com/advisories/60729