This indicates an attack attempt against a Command Injection vulnerability in ASUS RT-AC3200 router and devices running ASUSWRT.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. A remote attacker may be able to exploit this to execute arbitrary commands within the context of the application, via a crafted HTTP request.
ASUS RT-AC3200 router and devices running ASUSWRT.
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade firmware to revision 188.8.131.52.384.32738 or newer.