Tenda AX1803 v1.0.0.1 contains a stack overflow via the serverName parameter in the function fromAdvSetMacMtuWan.
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).