Unspecified vulnerability in the MySQL Server component in Oracle MySQL 5.5.25 and earlier allows remote authenticated users to affect availability via unknown vectors related to Server.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-3134
http://www.ubuntu.com/usn/USN-1621-1
http://www.oracle.com/technetwork/topics/security/cpuoct2012-1515893.html
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150