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).
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.