This indicates an attack attempt against an Path Traversal vulnerability in ManageEngine Desktop Central.
The vulnerability is due to insufficient sanitizing of user supplied inputs when handling a crafted HTTP packet. It allows a remote attacker to execute arbitrary codes against affected machine via crafted requests.
ManageEngine Desktop Central MSP prior to 9 build 90142
ManageEngine DesktopCentral prior to 9 build 90142
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the latest update from the vendor