The default configuration in Apache Cassandra 1.2.0 through 1.2.19, 2.0.0 through 2.0.13, and 2.1.0 through 2.1.3 binds an unauthenticated JMX/RMI interface to all network interfaces, which allows remote attackers to execute arbitrary Java code via an RMI request.
http://www.securitytracker.com/id/1034002
http://www.securityfocus.com/bid/73478
http://www.securityfocus.com/archive/1/535154/100/0/threaded
http://www.mail-archive.com/user%40cassandra.apache.org/msg41819.html
http://rhn.redhat.com/errata/RHSA-2015-1947.html
http://packetstormsecurity.com/files/131249/Apache-Cassandra-Remote-Code-Execution.html