Unspecified vulnerability in the XDK and XDB - XML Database component in Oracle Database Server 11.2.0.3, 11.2.0.4, and 12.1.0.1 allows remote authenticated users to affect availability via unknown vectors.
http://www.securitytracker.com/id/1032118
http://www.oracle.com/technetwork/topics/security/cpuapr2015-2365600.html