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Product support

Security Advisories


TN-5900 Series Secure Routers Vulnerability

A product vulnerability was identified in Moxa’s TN-5900 Series Secure Routers. In response to this, Moxa has developed related solutions to address this vulnerability. 

The identified vulnerability types and potential impacts are shown below:

Item Vulnerability Type Impact
1 Memory Leak Continuously sending crafted packets may cause an affected device to experience a memory leak and fail to release memory when it is no longer required.



Affected Products:

The affected products and firmware versions are shown below.

Product Series Affected Versions
TN-5900 Series Firmware Version 3.1 or lower.



Moxa has developed appropriate solutions to address the vulnerabilities. The solutions for affected products are shown below.

Product Series Solutions
TN-5900 Series Please contact Moxa Technical Support for a security patch.


We would like to express our appreciation to Qian Chen from the Codesafe Team of Legendsec at Qi'anxin Group for reporting the vulnerability, working with us to help enhance the security of our products, and helping us provide a better service to our customers.

Revision History:

1.0 First Release Dec 28, 2021
1,1 Add CVE information Jan 13, 2023

Relevant Products

TN-5900 Series ·

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If you are concerned about a potential cybersecurity vulnerability, please contact us and one of technical support staff will get in touch with you.

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