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Security Advisories

SUMMARY

CVE-2026-10828, CVE-2026-10829: Use of Externally-Controlled Format String and Stack-based Buffer Overflow Vulnerabilities in Serial Device Servers

This security advisory addresses two vulnerabilities identified in serial device servers.

CVE-2026-10828

A format string vulnerability has been found in the "alias" parameter of the Serial Param configuration page in the NPort W2150A-W4/W2250A-W4 Series version 1.5 and prior. This vulnerability stems from insufficient input validation and improper handling of externally supplied format strings. An attacker could exploit this vulnerability by sending crafted input to the web service, causing unintended memory disclosure. Successful exploitation may allow an attacker to leak sensitive memory contents and determine critical memory addresses, potentially bypassing Address Space Layout Randomization (ASLR) protections.

CVE-2026-10829

A stack-based buffer overflow vulnerability has been found in the NPort W2150A-W4/W2250A-W4 Series version 1.5 and earlier. This vulnerability stems from insufficient input validation of user-supplied input in the "Server location" parameter on the Basic settings page. An attacker could exploit this vulnerability by sending crafted input to the web service, resulting in memory corruption. Successful exploitation of this vulnerability could allow remote code execution on the target system with root privileges.

Given the high severity of these issues, users should apply the solutions immediately to reduce security risks.

 

The Identified Vulnerability Type and Potential Impact 

CVE ID Vulnerability Type Impact
CVE-2026-10828

CWE-134: Use of Externally-Controlled Format String

CAPEC-135: Format String Injection
CVE-2026-10829 CWE-121: Stack-based Buffer Overflow CAPEC-100: Overflow Buffers

Vulnerability Scoring Details 

CVE ID
Base Score
Vector
Severity

Unauthenticated

Remote Exploits

CVE-2026-10828

CVSS 4.0: 6.9

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

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

Medium No
CVE-2026-10829 CVSS 4.0: 8.6

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

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

High No
AFFECTED PRODUCTS AND SOLUTIONS

Solutions

Moxa has developed appropriate solutions to address these vulnerabilities. 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 (v1.5.1)
NPort W2150A/W2250A Series Firmware v2.3 and earlier
  • Replace the phased-out product with NPort W2150A-W4/W2250A-W4 Series v1.5.1 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.

 

Acknowledgement

We would like to thank Remi ONNO of CS GROUP France (Sopra Steria Group) for reporting this vulnerability, collaborating with us to enhance the security of our products, and contributing to our efforts to deliver better service to our customers.

 

Revision History:

VERSION DESCRIPTION RELEASE DATE
1.0 First release June 16, 2026

Relevant Products

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

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