D-Link Go-RT-AC750 GORTAC750_A1_FW_v101b03 contains a stack-based buffer overflow via the function hnap_main. An attacker can send a POST request to trigger the vulnerablilify.
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).