The HTTP BIO connector in Apache Tomcat 7.0.x before 7.0.12 does not properly handle HTTP pipelining, which allows remote attackers to read responses intended for other clients in opportunistic circumstances by examining the application data in HTTP packets, related to "a mix-up of responses for requests from different users."
http://seclists.org/fulldisclosure/2011/Apr/97
http://securityreason.com/securityalert/8188
https://exchange.xforce.ibmcloud.com/vulnerabilities/66676
https://issues.apache.org/bugzilla/show_bug.cgi?id=50957
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12374
http://svn.apache.org/viewvc?view=revision&revision=1086349
http://svn.apache.org/viewvc?view=revision&revision=1086352
http://tomcat.apache.org/security-7.html