A shell injection issue in cosawifiapis.c in the RDK RDKB-20181217-1 CcspWifiAgent module allows attackers with login credentials to execute arbitrary shell commands under the CcspWifiSsp process (running as root) if the platform was compiled with the ENABLEFEATUREMESHWIFI macro. The attack is conducted by changing the Wi-Fi network password to include crafted escape characters. This is related to the WebUI module.