Zte F680 Exploit

ZTE has released patches, but ISPs are slow to deploy them. You have two options:

Using a simple Python script, the attacker sends a POST request to /cgi-bin/telnet.cgi with no session cookie. If the device is vulnerable, the response 200 OK appears, and Telnet is enabled on port 23.

Alternatively, for devices behind NAT but with remote management (TR-069) exposed, attackers exploit the command injection on port 80.

If you have an F680, assume it is compromised or compromisable: zte f680 exploit

The web interface’s diagnostic "Ping" tool fails to sanitize user input.

Vulnerable Endpoint: /cgi-bin/Diagnostic_setting.asp

Exploit Method:

Result: A bind shell on port 9999 with full system privileges.

Bridge Mode: Convert your ZTE F680 into a pure “dumb” modem (bridge mode). Then, purchase a reputable third-party router (e.g., Asus, TP-Link, Ubiquiti) to handle your Wi-Fi and firewall.

Why this works: In bridge mode, the ZTE F680 stops routing traffic. It simply converts fiber to Ethernet. The WAN IP goes to your new, secure router. Even if the ZTE is exploited, it has no network control because all ports are passed through to your secure device. ZTE has released patches, but ISPs are slow to deploy them

Let’s walk through a realistic exploit chain used by botnets (like Mirai variants) and red-teamers against the ZTE F680.

The most severe and persistent exploit is not a bug—it’s a feature left over from development.

Discovery: Researchers found that many ZTE F680 units contain a secondary, undocumented user account. Result: A bind shell on port 9999 with

Why it works: This password bypasses the web login lockout policies. It often grants access not just to the web UI, but to Telnet (Port 23) and SSH (Port 22) if those services are hidden in the GUI.

Impact: An attacker on your local network can simply attempt to Telnet to the router’s IP. If the firmware hasn’t been patched, they are instantly logged in as root—the highest privilege level. From there, they can: