A stack overflow vulnerability exists in the httpd service in ASUS RT-AX56U Router Version 3.0.0.4.386.44266. This vulnerability is caused by the strcat function called by "caupload" input handle function allowing the user to enter 0xFFFF bytes into the stack. This vulnerability allows an attacker to execute commands remotely. The vulnerability requires authentication.

ASUS RT-AX56U’s login function contains a path traversal vulnerability due to its inadequate filtering for special characters in URL parameters, which allows an unauthenticated local area network attacker to access restricted system paths and download arbitrary files.