A critical stack-based buffer overflow vulnerability has been discovered in Tenda W12 router version 3.0.0.7(4763). The vulnerability affects the cgiSysTimeInfoSet function in the /bin/httpd file, where manipulation of the 'sec' argument can trigger the overflow. This vulnerability can be exploited remotely and poses significant security risks. Public exploits have been disclosed and are available for use, making this a high-priority security issue. The vulnerability allows attackers to potentially execute arbitrary code or cause denial of service on affected devices.