Product: ZMM220 Platform / Embedded Devices Service: Telnet (Port 23) Vulnerability Type: Use of Default/Hardcoded Credentials CVSS Score: 9.8 (Critical)
If none of the above passwords work, consider these possibilities:
Before diving into the specifics of the default Telnet password, it's crucial to understand what the ZMM220 is and its role in network infrastructure. The ZMM220 is part of ZTE's series of network management devices, designed to monitor, manage, and troubleshoot network operations. Its capabilities include performance monitoring, fault management, and configuration management, making it an indispensable tool for network administrators.
Likelihood: High Automated botnets actively scan the internet for Port 23 (Telnet) and attempt brute-force login using default credential dictionaries. Devices exposed to the public internet are compromised within minutes of deployment.
Impact: Critical Successful exploitation results in a complete loss of confidentiality, integrity, and availability of the affected device. If the device resides on a trusted internal network, an attacker could potentially pivot to other critical servers or exfiltrate sensitive data (e.g., video surveillance feeds).
Once you have accessed your ZMM220 using the default credentials, it's imperative to secure your device to prevent unauthorized access. Here are several steps to enhance the security of your ZMM220:
It is recommended that the IT Security team immediately perform the following actions: zmm220 default telnet password
The ZMM220 is a core hardware platform and kernel used in many
biometric and access control devices, such as the InBio Pro series. While these devices typically rely on proprietary communication ports (like 4370) for software management, they often run a Linux-based operating system that may have an active Telnet service for low-level maintenance. Common Default Telnet Credentials
Security research and community findings suggest several credential sets that the manufacturer has historically used for Telnet access across ZMM220-based platforms: / Password:
— Frequently cited for many ZK-based embedded Linux systems. / Password:
— Another common legacy credential for various ZKSoftware modules. / Password: (No Password)
— Some firmware versions allow root access without a password, though this is less common in newer security-focused builds. / Password: Product: ZMM220 Platform / Embedded Devices Service: Telnet
— Specifically noted in some technical teardowns of ZK hardware. Internal Configuration Variables
In some instances, the Telnet password may be stored as a variable within the device's internal configuration files. Security reviews on platforms like have identified instances where a variable is hardcoded or set to a default value such as z1k2t3e4c5h Other Related Default Passwords
For general administrative access (not Telnet) via the device's physical menu or web interface, the following defaults are standard: Web Panel Admin: Physical Device Admin: Super Password (Time-based):
A temporary password generated using the device's current display time. Security Considerations
Leaving Telnet active with default credentials poses a significant security risk, as it grants full shell access to the device's operating system. It is highly recommended to disable Telnet through the ZKTeco management software or change these passwords immediately upon deployment. through the ZKTeco management console? User Manual - zkteco.me
(a ZKTeco core board used in biometric terminals) typically uses the following default credentials for Telnet and administrative access: If you are accessing the device menu The ZMM220 is a core hardware platform and
directly or through the SDK, the default administrator password is often www.zkteco.com.br Connection Steps Network Setup:
Ensure your PC is on the same subnet as the ZMM220 board (standard default IP is often 192.168.1.201 Terminal Client: Use a client like or the native Windows command prompt. telnet [Device_IP] telnet 192.168.1.201 Enter the credentials provided above. Important Notes Case Sensitivity: Credentials like are strictly lowercase.
Telnet is an unencrypted protocol. It is highly recommended to change these defaults immediately upon login to prevent unauthorized access to the biometric data or system configuration. Manufacturer Support: If these do not work, consult the specific ZKTeco Support
page for your hardware model, as some firmware versions may have unique localized defaults. Installation & User Guide - ZKTeco
Enter the administrator password. (The default password is 1234.) www.zkteco.com.br User Manual - ZKTeco ☺Note: The default administrator password is 1234. www.zkteco.com.br Installation & User Guide - ZKTeco
Enter the administrator password. (The default password is 1234.) www.zkteco.com.br User Manual - ZKTeco ☺Note: The default administrator password is 1234. www.zkteco.com.br
Unlocking the ZMM220: A Comprehensive Guide to Default Telnet Passwords and Secure Configuration
The ZMM220, a device from the reputable manufacturer ZTE, is a versatile and feature-rich piece of equipment designed to facilitate efficient and reliable network management. As with many network devices, accessing the ZMM220 for configuration and management often requires authentication through Telnet, a widely used protocol for remote access. However, for those unfamiliar with the device or its default settings, finding the correct Telnet password can be a challenge. This article aims to provide a detailed overview of the ZMM220's default Telnet password, along with essential information on securing your device and best practices for network management.