Unspecified vulnerability in the Server component in Oracle MySQL 5.1.66 and earlier and 5.5.28 and earlier allows remote attackers to affect availability via unknown vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17186
http://www.ubuntu.com/usn/USN-1703-1
http://www.oracle.com/technetwork/topics/security/cpujan2013-1515902.html
http://security.gentoo.org/glsa/glsa-201308-06.xml