MySQL is using improper access control. It allows remote authenticated users to affect availability via unknown vectors related to Information Schema.
dev.mysql.com/doc/relnotes/mysql/5.1/en/news-5-1-68.html
dev.mysql.com/doc/relnotes/mysql/5.1/en/news-5-1-69.html
rhn.redhat.com/errata/RHSA-2013-0772.html
secunia.com/advisories/53372
security.gentoo.org/glsa/glsa-201308-06.xml
www.mandriva.com/security/advisories?name=MDVSA-2013:150
www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html#AppendixMSQL
access.redhat.com/security/cve/CVE-2013-3808
access.redhat.com/security/updates/classification/#important
rhn.redhat.com/errata/RHSA-2013-0772.html