CVE-2015-2643
Unspecified vulnerability in Oracle MySQL Server 5.5.43 and earlier and 5.6.24 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/75830
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html