A critical security vulnerability has been discovered in Tenda i3 router firmware version 1.0.0.6(2204). The vulnerability affects the formWifiMacFilterSet function in the /goform/WifiMacFilterSet file, where manipulation of the index argument leads to a stack-based buffer overflow. This flaw can be exploited remotely, allowing attackers to potentially execute arbitrary code or cause denial of service. The exploit code has been publicly released and is available on GitHub, significantly increasing the risk of active exploitation. The vulnerability represents a serious security threat to users of affected Tenda i3 routers.