Administrators should check their device firmware versions. If a ZMM220-based device is running firmware earlier than 15.00, it does include the security enhancements introduced in 2025.
ZKTeco's ZMM220 hardware platform powers a wide range of biometric access control and time attendance terminals, including the ProCapture series, FV350, and iFace702, among others. These Linux-based systems use the Telnet protocol for remote management, making default credentials a critical security concern. This article explores everything you need to know about the ZMM220's default Telnet password, recent updates, and essential security measures.
The ZMM220 platform typically runs a Linux-based environment (often Kernel 3.0.8 on MIPS architecture). Multiple sources indicate that the following combinations are the most common default credentials for accessing the device via Telnet (Port 23): root | Password: (blank/empty) Username: root | Password: solokey Username: root | Password: colorkey Username: root | Password: swsbzkgn Username: admin | Password: admin zmm220 default telnet password updated
This allows technicians to access the device’s file system ( /mnt/mtdblock/commonres/ ) for customization, troubleshooting, or firmware diagnostics.
What is the currently installed on your ZMM220? Administrators should check their device firmware versions
These devices are known to store credentials in a plain-text configuration file named ZKConfig.cfg within a tar archive that can often be downloaded via the web interface. It is highly recommended to change these default passwords and disable Telnet if it is not required for your operations, as it is an unencrypted protocol.
: [Check vendor documentation for the specific default string if it has not yet been changed] 3. Apply the New Password These Linux-based systems use the Telnet protocol for
Reports have emerged about an for the ZMM220 platform. According to these sources, the default Telnet password has been modified to enhance security and prevent unauthorized access.
Security frameworks like OWASP consistently rank weak or default credentials as a top IoT vulnerability. Manufacturers must update firmware deployment practices to eliminate these static entry points. What Changed in the Updated ZMM220 Firmware?
