A critical buffer overflow vulnerability has been discovered in Tenda F456 router firmware version 1.0.0.5. The flaw exists in the fromNatlimitof function within the /goform/Natlimit file of the httpd component. This vulnerability can be exploited remotely through manipulation of the affected function. The security flaw allows attackers to cause buffer overflow conditions, potentially leading to code execution or system compromise. Public exploit code has been released and is available for use, significantly increasing the risk to affected systems.