This indicates an attack attempt against an arbitrary Code Execution vulnerability in MySQL server.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. If a login scanner is used obtained a valid admin credentials, a remote attacker can exploit this using the admin credentials to execute arbitrary code with the context of the application.
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.
Alternatively, it is recommended that user privileges be restricted and admin password should be changed to a complex one.