Tenda AC6(AC1200) v5.0 Firmware v02.03.01.114 and below contains an issue in the component /cgi-bin/DownloadFlash which allows attackers to steal all data such as source code and system files via a crafted GET request.
https://drive.google.com/drive/folders/1VxR4lhaWNWLuAPdJK2aRF6zfo_mRyiFO?usp=sharing