D-Link DIR-809 formSetPortTr Buffer Overflow Vulnerability (CNVD-2021-94717)

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 in the product formSetPortTr function fails to effectively determine data boundaries. An attacker could cause a buffer overflow resulting in a denial of service or code execution via a POST request.