Once logged in, an attacker has full control over the router's configuration, including DNS settings and firewall rules. 2. Directory Traversal (Arbitrary File Read)
. This flaw allows unauthenticated attackers on a local network to bypass front-end length limits on WAN connection names using an HTTP proxy. By tampering with these parameters, an attacker can perform unauthorized operations through the web management interface. Information Leakage and Credential Vulnerabilities Other ZTE models in the same family have faced issues like CVE-2020-6864
If you cannot get a patched firmware, replace the device. A $50 router from a reputable brand (or a community-supported OpenWrt device) is far cheaper than the cost of a ransomware attack or identity theft that starts with a compromised edge router.
Scan connected laptops, smartphones, smart TVs, and IoT devices for further vulnerabilities. 4. How to Secure and Mitigate ZTE F680 Vulnerabilities zte f680 exploit
Perhaps the most critical vulnerability affecting the ZTE F680 is designated . Published in June 2020, this vulnerability is classified as critical , with a CVSS v3.1 base score of 6.5.
Several Common Vulnerabilities and Exposures (CVEs) have been assigned to the ZTE F680 firmware. The most critical ones revolve around authentication bypass and command injection.
To protect against these exploits, users and administrators should take the following steps: ZTE F680 Router Login and Password - Modemly Once logged in, an attacker has full control
As of the most recent vulnerability databases, for CVE-2020-6868. The estimated exploit price on underground markets is between $0 and $5,000 USD, with a CTI Interest Score of 0.00, indicating relatively low real-time attacker interest.
The ZTE F680 is a capable GPON home gateway, but it carries a troubling security profile. Official vulnerabilities like CVE-2020-6868 and CVE-2022-23136 demonstrate that basic input validation and access control mechanisms have been insufficient in multiple firmware versions. More critically, community‑developed techniques—from SAMBA configuration hijacking to Telnet enablement tools and hardware UART extraction—prove that an attacker with local network or physical access can easily gain complete control over the device.
A different twist on the SAMBA vulnerability allows for direct extraction of the firmware image. By manipulating the SAMBA configuration to expose the entire root filesystem, a remote attacker can copy the NAND flash contents byte‑by‑byte without ever opening the physical device. This technique is particularly dangerous because it can be performed remotely and silently. This flaw allows unauthenticated attackers on a local
The router stores its system configurations—including PPPoE credentials, ISP passwords, and local Wi-Fi keys—in an encrypted or sometimes unencrypted backup file (typically config.bin or user_config.tar.gz ).
The ZTE F680 exploits highlight the persistent issue of security misconfigurations in ISP-grade hardware. The combination of weak access controls, information disclosure via URL endpoints, and hardcoded service accounts makes it a vulnerable device if left unpatched. While patches exist, the fragmentation of ISP firmware rollouts means many of these devices remain vulnerable in the wild. Securing these devices requires a proactive approach from both the user (changing passwords) and the ISP (deploying security patches).
, bypassing ISP restrictions, or extracting sensitive configuration data