A stack-based buffer overflow vulnerability was discovered in Tenda W12 router firmware version 3.0.0.7(4763). The vulnerability affects the cgiWifiMacFilterSet function in /bin/httpd file. An attacker can exploit this by manipulating the wifiMacFilterSet.macList.mac argument. The attack can be launched remotely, making it particularly dangerous. The exploit code has been publicly disclosed and is available for use. This represents a critical security flaw in network infrastructure equipment that could allow remote code execution.