D-Link DIR-809 formVirtualApp buffer overflow vulnerability

D-Link DIR-809 is a dual-band router from D-Link (China).D-Link DIR-809 device firmware version DIR-809Ax_FW1.12WWB03_20190410 has a buffer overflow vulnerability, which originates from FUN_8004776c of the software formVirtualApp A stack buffer overflow vulnerability exists in the function. The vulnerability is triggered by a crafted POST request. An attacker could use this vulnerability to gain control of the server.