This indicates an attack attempt against a remote Code Execution vulnerability in Netwin SurgeFTP.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when parsing HTTP requests. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application via a crafted HTTP request.
Netwin SurgeFTP 23c8 and prior version
System Compromise: Remote attackers can execute arbitrary code on vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.