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Security Advisories

SUMMARY

Security Enhancement: SSH Weak Algorithms Supported

The remote SSH server is configured to allow weak encryption algorithms or no algorithm at all. (Source: Tenable Nessus)

Since this is a medium severity issue, users can assess their environment and schedule the update during the next maintenance or update cycle.

AFFECTED PRODUCTS AND SOLUTIONS

Solutions

Moxa has developed appropriate solutions to enhance the security. The solutions for the affected products are listed in the following table: 

Product Series Affected Versions Solutions
EDS-510E Series Firmware v5.7 and earlier Please contact Moxa Technical Support for the security patch (v5.7.4)

EDS-400 Series

  • EDS-405A Series
  • EDS-408A Series

Firmware

  • v3.16 and earlier
  • v3.15 and earlier

Firmware

EDS-500 Series

  • EDS-505A Series
  • EDS-508A Series
  • EDS-510A Series
  • EDS-516A Series
  • EDS-518A Series
  • EDS-G509 Series
  • EDS-P510A Series

Firmware

  • v3.12 and earlier
  • v3.12 and earlier
  • v3.13 and earlier
  • v3.13 and earlier
  • v3.13 and earlier
  • v3.11 and earlier
  • v3.13 and earlier

Firmware

EDS-600 Series

  • EDS-608 Series
  • EDS-611 Series
  • EDS-616 Series
  • EDS-619 Series

Firmware

  • v3.13 and earlier
  • v3.13 and earlier
  • v3.13 and earlier
  • v3.13 and earlier

Firmware

PT Series

  • PT-508 Series
  • PT-510 Series
  • PT-7528 Series
  • PT-7728 Series
  • PT-7828 Series
  • PT-G503 Series
  • PT-G510 Series
  • PT-G7728 Series
  • PT-G7828 Series

Firmware

  • v3.8 and earlier
  • v3.8 and earlier
  • v5.0 and earlier
  • v3.9 and earlier
  • v4.0 and earlier
  • v5.3 and earlier
  • v6.5 and earlier
  • v6.6 and earlier
  • v6.6 and earlier

Please contact Moxa Technical Support for the security patch

  • v3.8.12
  • v3.8.12
  • v5.0.34
  • v3.9.6
  • v4.0.8
  • v5.3.12
  • v6.5.22
  • v6.6.4
  • v6.6.4

TSN-G5000 Series

  • TSN-G5004 Series
  • TSN-G5008 Series
Firmware v2.4 and earlier Please contact Moxa Technical Support for the security patch (v2.5)

TN-A Series

  • TN-4500A Series
  • TN-5500A Series
Firmware v4.1 and earlier Firmware v4.2 or later

 

Mitigations

To mitigate the risk, we recommend the following actions:

  • Refer to the General Security Recommendations section to further strengthen your security context.

 

General Security Recommendations

To safeguard devices and networks, we recommend implementing the following recommendations to mitigate potential risks:

  1. Restrict Network Access
    • Use firewalls or access control lists (ACLs) to limit communication to trusted IP addresses and networks.
    • Segregate operational networks from other networks (e.g., enterprise networks) using VLANs or physical separation.
  2. Minimize Exposure
    • Avoid exposing devices directly to the Internet.
    • Disable unused network services and ports to reduce the attack surface.
  3. Enhance Device Authentication and Access Control
    • Implement multi-factor authentication (MFA) for accessing critical systems.
    • Use role-based access control (RBAC) to enforce the principle of least privilege.
  4. Regularly Update Firmware and Software
    • Keep devices updated with the latest firmware versions and security patches.
    • Establish a regular patch management schedule to address newly identified vulnerabilities.
  5. Secure Remote Access
    • Use encrypted communication protocols (e.g., VPN, SSH) for remote access.
    • Restrict remote access to authorized personnel only and enforce strong authentication mechanisms.
  6. Implement Anomaly Detection Techniques
    • Monitor network traffic and device behavior for unusual or unauthorized activities.
    • Use tools or techniques that can identify anomalies and provide alerts for potential threats.
  7. Implement Logging and Monitoring
    • Enable event logging and maintain audit trails on devices.
    • Regularly review logs for anomalies and unauthorized access attempts.
  8. Conduct Regular Security Assessments
    • Perform vulnerability assessments to identify potential risks.
    • Regularly review device configurations to ensure compliance with security policies.

 

Revision History:

VERSION DESCRIPTION RELEASE DATE
1.0 First release December 12, 2025
1.1 Add Solutions for PT Series April 20, 2026
1.2 Add Solutions for EDS, TSN, TN-A Series July 27, 2026

Relevant Products

EDS-405A Series · EDS-408A Series · EDS-505A Series · EDS-508A Series · EDS-510A Series · EDS-510E Series · EDS-516A Series · EDS-518A Series · EDS-608 Series · EDS-611 Series · EDS-616 Series · EDS-619 Series · EDS-G509 Series · EDS-P510A Series · PT-508 Series · PT-510 Series · PT-7528 Series · PT-7728 Series · PT-7828 Series · PT-G503 Series · PT-G510 Series · PT-G7728 Series · PT-G7828 Series · TN-4500A Series · TN-5500A Series · TSN-G5004 Series · TSN-G5008 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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