A critical stack-based buffer overflow vulnerability has been discovered in Tenda FH1201 router version 1.2.0.14(408). The vulnerability affects the WrlclientSet function in the Parameter Handler component, specifically in the /goform/WrlclientSet file. An attacker can exploit this vulnerability by manipulating the GO argument, leading to a stack-based buffer overflow. The vulnerability can be exploited remotely, making it particularly dangerous. Public exploits are now available, increasing the risk of active exploitation. This vulnerability poses a high security risk to affected Tenda router users.