If your ZMM220 is still running an older firmware (pre-v2.3.1), you need to manually update it to benefit from the improved security. Here is a step-by-step guide:
passwd admin
You'll be prompted to enter a new password and then confirm it. zmm220 default telnet password updated
Maintaining these default credentials creates severe vulnerabilities:
The mention of "Telnet" in the subject is the first red flag that cybersecurity experts would identify. Telnet is a relic of a more trusting era in computing history. Developed in 1969, it was the original protocol for remote server management. However, it carries a fatal flaw: it lacks encryption. When a user authenticates via Telnet, their credentials—including the password—are transmitted in clear text across the network. Anyone with the capability to "sniff" network traffic can intercept these packets and read the password as easily as reading a postcard. In 2024, the continued existence of Telnet on any device, let alone a sophisticated unit like the ZMM220, is a security liability. If your ZMM220 is still running an older firmware (pre-v2
One GitHub user who attempted Telnet access noted in Chinese language comments that "the Telnet password appears to be related to the factory time and machine model. This is set by the developers". This suggests that the default password may vary depending on the specific manufacturing date and device model, adding another layer of complexity to identifying the correct credentials.
For the (a common hardware platform for ZKTeco biometric and access control devices), the default telnet password found in configuration backups is: Telnet Password: z1k2t3e4c5h Telnet is a relic of a more trusting
Always run the latest manufacturer-released firmware. Updated firmware can patch known vulnerabilities and may alter default network behaviors.
However, security standards have evolved. If you are searching for the status, you are likely finding that the "old reliable" credentials no longer work. The Evolution of ZMM220 Credentials
If you are managing ZMM220 devices, you must audit their connection settings to prevent unauthorized network intrusion. 1. Test for Default Access
The ZMM220 platform and related ZKTeco products have been subject to several documented security vulnerabilities: