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 Information Schema.
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