ParametersInterceptor in Apache Struts before 2.3.20 does not properly restrict access to the getClass method, which allows remote attackers to "manipulate" the ClassLoader and execute arbitrary code via a crafted request. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-0094.
https://cwiki.apache.org/confluence/display/WW/S2-021
https://bugzilla.redhat.com/show_bug.cgi?id=1091939
https://access.redhat.com/errata/RHSA-2019:0910
http://www.vmware.com/security/advisories/VMSA-2014-0007.html
http://www.securityfocus.com/bid/67064
http://www.securityfocus.com/archive/1/532549/100/0/threaded
http://www.securityfocus.com/archive/1/531952/100/0/threaded
http://www.oracle.com/technetwork/topics/security/cpuapr2015-2365600.html
http://www-01.ibm.com/support/docview.wss?uid=swg21676706
http://secunia.com/advisories/59500
http://secunia.com/advisories/59178
http://packetstormsecurity.com/files/127215/VMware-Security-Advisory-2014-0007.html