As of June 15, 2022, this site no longer supports Internet Explorer. Please use another browser for the best experience on our site.

Product support

Security Advisories

SUMMARY

CVE-2024-7695: Out-of-bounds Write Vulnerability Identified in EN 50155 Switches

  • Security Advisory ID: MPSA-240164
  • Version: V1.0
  • Release Date: Feb 22, 2025
  • Reference:

    CVE-2024-7695 (Moxa) 

EN 50155 Switches are affected by an out-of-bounds write vulnerability. This vulnerability is caused by insufficient input validation, which allows writing data beyond buffer boundaries. Successful exploitation could result in a denial-of-service (DoS) attack. 

This vulnerability poses a significant remote threat if the affected products are exposed to publicly accessible networks. Attackers could potentially disrupt operations by shutting down the affected systems. Given the severity of this issue, immediate action is strongly recommended to mitigate potential exploitation. 

The Identified Vulnerability Type and Potential Impact 

Item Vulnerability Type Impact
1

Out-of-bounds Write (CWE-787) 

CVE-2024-7695

An out-of-bounds write vulnerability caused by insufficient input validation allows attackers to overwrite memory beyond the buffer’s bounds. Successful exploitation of this vulnerability could lead to a denial-of-service (DoS) condition, disrupting normal operations. 

Vulnerability Scoring Details 

ID
Base Score
Vector
Severity

Unauthenticated

Remote Exploits

CVE-2024-7695

CVSS 3.1: 7.5

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

High Yes
CVSS 4.0: 8.7

AV:N/AC:L/AT:N/PR:N/UI:N/

VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Note: This advisory uses CVSS 3.1 as the standard for determining severity levels. CVSS 4.0 is provided as a reference metric for comparison. 

AFFECTED PRODUCTS AND SOLUTIONS

Products Affected by CVE-2024-7695 

Affected products and their firmware versions are listed in the following table: 

Product Series Affected Versions
TN-G4500 Series Firmware version 5.3 and earlier
TN-G6500 Series Firmware version 5.4 and earlier 

 

Solutions

Moxa has developed appropriate solutions to address this vulnerability. The solutions for the affected products are listed in the following table: 

Product Series Solutions
TN-G4500 Series  Upgrade to the firmware version 5.5 or later 
TN-G6500 Series  Upgrade to the firmware version 5.5 or later 

 

Mitigations

To mitigate the risks associated with this vulnerability, we recommend the following actions: 

  • Disable Moxa Service and Moxa Service (Encrypted) temporarily if they are not required for operations. This will minimize potential attack vectors until a patch or updated firmware is applied. 

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

 

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 January 22, 2025

Relevant Products

TN-G4500 Series · TN-G6500 Series ·

  •   Print this page
  • You can manage and share your saved list in My Moxa
Let’s get that fixed

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

Report a Vulnerability
Added To Bag
You have some items waiting in your bag; click here to finish your quote!
Feedback