CVE-2012-5615

Oracle MySQL 5.5.38 and earlier, 5.6.19 and earlier, and MariaDB 5.5.28a, 5.3.11, 5.2.13, 5.1.66, and possibly other versions, generates different error messages with different time delays depending on whether a user name exists, which allows remote attackers to enumerate valid usernames.

Date published : 2012-12-03

http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html

http://www.oracle.com/technetwork/topics/security/cpuoct2014-1972960.html