Zte F680 Exploit -

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.

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

A common theme in ISP router security is the presence of "hidden" service accounts. The ZTE F680 has been scrutinized for running services that allow higher-level access than the web interface provides.

Look for these signs:

If compromised, perform a factory reset (press the reset pinhole for 30 seconds), then immediately update the firmware (if available), then change all passwords. A factory reset alone does not remove rootkits in the NVRAM.

The attacker scans for devices responding on port 80 or 443 with a specific HTTP title: ZTE F680 GPON ONT. The default login page often leaks the firmware version in the HTML source code. netstat -an | grep ESTABLISHED

In mid-2023, a Mirai-based botnet named Fodcha was observed scanning for ZTE F680 devices with the cgi-bin/telnet.cgi exploit. Over 100,000 devices were recruited into a DDoS swarm targeting financial institutions in Brazil and South Africa. The botnet operators did not steal credit cards; they rented out the collective bandwidth for Layer 7 attacks.