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Security Advisories

SUMMARY

CVE-2026-111548: Stack Buffer Overflow Vulnerability in Wireless Device Servers

This security advisory addresses a vulnerability identified in Wireless Device Servers.

CVE-2026-111548

A stack-based buffer overflow vulnerability exists in the web management interface of affected Moxa wireless device servers. An authenticated remote attacker with low privileges could exploit insufficient bounds checking of user-supplied input, causing the web management service to become unresponsive. Restoring the service requires power cycling the affected device, while other device functions remain operational.

Because the vulnerability is assessed as medium severity, users are suggested to evaluate their environment and schedule the update in the next maintenance or update cycle.

 

The Identified Vulnerability Type and Potential Impact 

CVE ID Vulnerability Type Impact
CVE-2026-111548

CWE-121: Stack-based Buffer Overflow

CAPEC-100: Overflow Buffers

Vulnerability Scoring Details 

CVE ID
Base Score
Vector
Severity

Unauthenticated

Remote Exploits

CVE-2026-111548

CVSS 4.0: 5.3

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

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

Medium No
AFFECTED PRODUCTS AND SOLUTIONS

Solutions

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

Product Series Affected Versions Solutions
NPort W2150A-W4/W2250A-W4 Series Firmware v1.5 and earlier Please contact Moxa Technical Support for the security patch (v1.5.9)

NPort W2150A/W2250A Series

*Note: End of life product

Firmware v2.3 and earlier
  • Replace the phased-out product with NPort W2150A-W4/W2250A-W4 Series v1.5.9 or later
  • Refer to the General Security Recommendations section to further strengthen your security context.

 

Mitigations

For users who may not be able to perform a firmware update, we provide the following recommended mitigation measures as an alternative to mitigate the risk associated with the vulnerability.

  • 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.
    • Prohibit the use of weak passwords and enforce a password policy that includes password complexity requirements, periodic password changes, and restrictions on password reuse.
  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 October 27, 2026

Relevant Products

NPort W2150A/W2250A Series · NPort W2150A-W4/W2250A-W4 Series ·

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