This indicates an attack attempt to exploit a Command Injection Vulnerability in Robustel R1510.
The vulnerability is due to insufficient validation of user-supplied inputs. Successful exploitation could lead to command injection.
Robustel R1510 3.1.16 and prior
Robustel R1510 3.3.0 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.