Unspecified vulnerability in the XDB - XML Database component in Oracle Database Server 11.2.0.4, 12.1.0.1, and 12.1.0.2 allows remote authenticated users to affect availability via unknown vectors.
http://www.securitytracker.com/id/1034709
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html