LBT T300-T390 v2.2.1.8 were discovered to contain a stack overflow via the apn_name_3g parameter in the setupEC20Apn function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted POST request.
https://github.com/cvdyfbwa/IoT_LBT_Router/blob/main/setupEC20Apn.md