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Security Advisories


MGate MB3180/MB3280/MB3480 Series Protocol Gateways Vulnerabilities

  • Security Advisory ID: MPSA-210905
  • Version: V1.0
  • Release Date: Sep 17, 2021
  • Reference:
    • CVE-2021-33823, CVE-2021-33824

Multiple product vulnerabilities were identified in Moxa’s MGate MB3180/MB3280/MB3480 Series. In response to this, Moxa has developed related solutions to address these vulnerabilities.

The identified vulnerability types and potential impacts are shown below:

Item Vulnerability Type Impact
1 Denial-of-service attack
An attacker could perform a denial-of-service attack by flooding the device with packets and exhausting the web servers’ resources.
2 Denial-of-service attack
An attacker could perform a denial-of-service attack by sending incomplete packets to exhaust the web servers’ resources.



Affected Products:

The affected products and firmware versions are shown below.

Product Series Affected Versions
MGate MB3180 Series Firmware Version 2.2 or lower
MGate MB3280 Series Firmware Version 4.1 or lower
MGate MB3480 Series Firmware Version 3.2 or lower



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

Product Series Solutions
MGate MB3180 Series
MGate MB3280 Series
MGate MB3480 Series
To mitigate this issue, enable the ‘Accessible IP’ function to provide an allow list for the connected devices.
Alternatively, add a router/firewall with rate limit or allow list functionality enabled between the MGate devices and the public network.


We would like to express our appreciation to Parul Sindhwad, Pranita Binnar and Dr. Faruk Kazi from COE-CNDS Lab, VJTI Mumbai, India., and Jian Xian Li, Hao Hsiang Lin, and Guan Yu Lai from Taiwan Telecom Technology Center for reporting the vulnerabilities, 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 Sep 17, 2021

Relevant Products

MGate MB3180/MB3280/MB3480 Series ·

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