This indicates an attack attempt to exploit a Command Injection Vulnerability in Moxa EDR-810.
The vulnerability is due to an error in the vulnerable application when handling a maliciously crafted HTTP request. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted request.
Moxa EDR-810 V4.1 build 17030317 and earlier
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor: