The most famous "exploit" for the F680 is not a bug but a deliberate backdoor. The device contains a hidden superuser account that cannot be deleted or changed via the standard web interface.
Credentials:
Why this works: The device checks for this specific string in the login POST request. If matched, it grants full administrative access (Telnet/SSH and Web GUI) without standard authentication checks. zte f680 exploit
Impact:
netstat -an | grep ESTABLISHED
Look for Zte521 logins in the system log (Administration > Logs). If you see them and didn’t log in yourself – you are pwned. The most famous "exploit" for the F680 is
Let’s walk through a realistic exploit chain used by botnets (like Mirai variants) and red-teamers against the ZTE F680. Why this works: The device checks for this