D-Link DIR-809 formVirtualServ Buffer Overflow Vulnerability (CNVD-2021-94719)

A buffer overflow vulnerability exists in the D-Link DIR-809, a dual-band router from D-Link (China).The vulnerability stems from the failure of the FUN_8004776c function in the product/formVirtualServ link 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.