This indicates an attack attempt against a buffer-overflow vulnerability in MySQL database server.
The vulnerability is caused by an error when the vulnerable software handles a specially crafted table name argument in a COM_FIELD_LIST command packet. It allows a remote attacker to execute arbitrary code.
Oracle MySQL 5.1.41 and previous versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Update to version 5.1.47 or later: