An issue was discovered on Tenda AC7 V15.03.06.44_CN AC9 V15.03.05.19(6318)_CN AC10 V15.03.06.23_CN AC15 V15.03.05.19_CN and AC18 V15.03.05.19(6318)_CN devices. There is a buffer overflow vulnerability in the router's web server. While processing the ssid parameter for a POST request the value is directly used in a sprintf call to a local variable placed on the stack which overrides the return address of the function causing a buffer overflow.