The KuWFi 4G AC900 LTE router 1.0.13 is vulnerable to command injection on the HTTP API endpoints /goform/formMultiApnSetting and /goform/atCmd. An authenticated attacker can execute arbitrary OS commands with root privileges via shell metacharacters in parameters such as pincode and cmds. Exploitation can lead to full system compromise, including enabling remote access (e.g., enabling telnet).