This indicates an attack attempt to exploit a Command Injection Vulnerability in Delta Electronics DX-2100-L1-CN.
The vulnerability is due to lack of validation of user-supplied inputs. Successful exploitation allows an attacker to gain full access to the underlying operating system of the device with all implications.
Delta Electronics DX-2100-L1-CN firmware version V18.104.22.168
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.