This indicates an attack attempt to exploit a SQL Injection Vulnerability in Zoho ManageEngine OpManager.
The vulnerability is a result of the application's failure to properly sanitize user input before using it in a SQL query. As a result, a remote attacker can send a crafted query to execute SQL commands on a vulnerable server.
Zoho Corporation ManageEngine OpManager prior to 12.3 Build 123222
System Compromise: Remote attackers can access or modify data in the database of the affected application
Refer to the vendor's advisory for updates: