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Home> Support > Security Center > Security Bulletins >Notice Regarding Security Vulnerability in WL20

Notice Regarding Security Vulnerability in WL20

2025-07-22

Dear Valued Customers,

 

1. Vulnerability Details

 

Scope of Impact: ZLM31-FXO1-3.1.8 and earlier versions

Vulnerability Overview: There are vulnerabilities of plaintext storage information and MQTT communication protocol in the Wi-Fi module. With attackers physically disassembling and cracking the device, the basic attendance information stored internally could be exposed.

 

2. Vulnerability Solution

 

A. The mentioned vulnerability has been fixed in the ZLM31-FXO1-4.0.3 version. Users are strongly recommended to upgrade to the latest version. If replacement of the Wi-Fi module is needed, you may contact the official technical support for a specific replacement plan.

 

3. Contact Information

 

A. Please email to zkjs@zkteco.com to obtain the patch package for the fixed version.

B. You may call the ZKTeco customer service hotline at 400-6900-999 to request the patch package for the repaired version.

C. You may also contact the ZKTeco branch in your region to obtain the patch package for the repaired version.


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