This indicates an attack attempt to exploit an Arbitrary File Upload Vulnerability in Zoho ManageEngine Desktop Central.
The vulnerability is due to an error in the application when handling a file upload request without authentication. A remote unauthenticated attacker may be able to exploit this to upload arbitrary files and perform remote code execution within the context of the application, via uploading a malicious file.
Zoho ManageEngine Desktop Central version 10.0 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.