This indicates an attack attempt to exploit a Remote Code Execution vulnerability in Zoho ManageEngine Application Manager product.
The vulnerability is due to improper validation of client supplied HTTP request. A remote attacker may be able to exploit this to execute arbitrary code within the context of the target application, via a crafted HTTP request.
ManageEngine Applications Manager before build 13740.
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the latest update from the vendor.