Tenda FH1202 v1.2.0.14(408) firmware has a stack overflow vulnerability via the adslPwd parameter in the formWanParameterSetting function.
The product writes data past the end, or before the beginning, of the intended buffer.
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).