An issue was discovered related to the default Parental Control PIN. If the PIN of the page "/ui/cbpc/login" is the default (0000), it is possible to bypass the login form by editing the path of the cookie `sid` generated by the page. This allows an attacker to access the router control panel with administrator privileges. The vulnerability is associated with the use of the predefined PIN code and can be exploited by a remote attacker to bypass authentication and gain access to the router's control panel with administrator privileges.