Log into the device's web interface or local panel and change , including:
Are you using (like ZKTime or BioTime) to manage the terminal? Share public link
If Telnet is enabled, the password is no longer a static string like solos . Instead, it is dynamically generated based on the device's unique serial number or requires a cryptographic handshake via the ZKAccess software.
: Ensure the device is running the latest firmware, as newer versions often address hardcoded credential vulnerabilities. zmm220 default telnet password updated
If you are prompted for a login and successfully enter using root and solos , your device is running outdated, vulnerable firmware. 2. Disable Telnet via the Device Menu If your device has a local display and keypad: Press the button to enter the main menu. Navigate to Comm. (Communication Settings). Select PC Connection or Ethernet .
: The most frequent default administrator password across many ZKTeco terminals is 1234 .
ZKTeco periodically releases firmware patches that change default credential behaviors or disable insecure legacy protocols like Telnet by default. Log into the device's web interface or local
Failing to update the default Telnet password exposes your facility to severe operational and security risks:
After using the updated default password to gain initial access, your responsibility is to transition the device to a fully hardened state: change the password, disable Telnet, enable encryption, and restrict access via firewalls.
The ZMM220 is typically a low-power embedded device used for IoT (Internet of Things) applications—often a serial-to-Ethernet converter or a wireless gateway. Historically, such devices shipped with a (e.g., admin / admin , root / 12345 , or zmm220 / zmm220 ) for both the web interface and legacy protocols like Telnet. : Ensure the device is running the latest
Often, the telnet root password is linked to the administrator password set on the device screen. Access the device interface. Navigate to -> System -> Reset Settings .
The security community has thoroughly documented the dangers of default credentials in ZKTeco devices. A comprehensive analysis of breaking into ZKTeco biometric machines identified two major attack vectors:
Use the passwd command immediately.
If telnet is not required for management, disable it through the system settings. Use SSH (if available) as a more secure alternative.
