CVE-2015-2571
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 : 2015-04-16
http://www.securityfocus.com/bid/74095
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html