CVE-2015-4757
Unspecified vulnerability in Oracle MySQL Server 5.5.42 and earlier and 5.6.23 and earlier allows remote authenticated users to affect availability via unknown vectors related to Server : Optimizer.
Date published : 2015-07-16
http://www.securityfocus.com/bid/75759
http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html