Another day, another security vulnerability.
Today Oracle announced security vulnerabilities and associated software patches affecting MySQL 5.5 and 5.6:
http://www.oracle.com/technetwork/topics/security/cpuoct2014-1972960.html#AppendixMSQL
To address these vulnerabilities, your database instances will need to be upgraded to either MySQL 5.5.40 or 5.6.21.
If you’re on a hosted service such as RDS, expect to be upgraded during your next maintenance window. More info can be found on Amazon’s security site.