Unspecified vulnerability in the MySQL Server component in Oracle MySQL 5.5.19 and earlier allows remote authenticated users to affect availability via unknown vectors related to Server Optimizer.
http://www.securitytracker.com/id?1026934
http://www.securityfocus.com/bid/53071
http://www.oracle.com/technetwork/topics/security/cpuapr2012-366314.html
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
http://security.gentoo.org/glsa/glsa-201308-06.xml
http://secunia.com/advisories/53372