An issue in Casa Systems NTC-221 version 2.0.99.0 and before allows a remote attacker to execute arbitrary code via a crafted payload to the /www/cgi-bin/nas.cgi component.
https://cybercx.com.au/blog/zero-day-rce-in-netcomm-ntc-221-industrial-iot-m2m-lte-4g-router/