This indicates an attack attempt to exploit an SQL injection vulnerability in ManageEngine OpManager.
The vulnerability is caused by lack of sanitizing of user supplied data when the vulnerable software handles a malicious packet. A remote attacker may be able to exploit this to execute arbitrary SQL code on the affected machine via crafted requests.
ManageEngine OpManager 11.6 or prior
System Compromise: Remote attackers can execute arbitrary SQL commands on affected machines
Apply the latest update from the vendor.