Unspecified vulnerability in the Server component in Oracle MySQL 5.1.66 and earlier, and 5.5.28 and earlier, allows remote authenticated users to affect availability via unknown vectors related to Server Optimizer.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16825
http://www.ubuntu.com/usn/USN-1703-1
http://www.oracle.com/technetwork/topics/security/cpujan2013-1515902.html