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Security Advisories

SUMMARY

CVE-2026-10825: Improper Validation of Input Vulnerability in Serial Device Servers

This security advisory addresses one vulnerability identified in serial device servers.

CVE-2026-10825

Improper JSON Input Validation in WebSocket API Leads to Denial of Service

A denial-of-service vulnerability exists in the WebSocket API due to insufficient validation and handling of JSON-based requests. A low-privileged authenticated attacker can send a specially crafted request that causes service disruption and may result in an unexpected device reboot.

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-2026-10825

CWE-1287: Improper Validation of Specified Type of Input

CAPEC-28: Fuzzing

Vulnerability Scoring Details 

CVE ID
Base Score
Vector
Severity

Unauthenticated

Remote Exploits

CVE-2026-10825

CVSS 4.0: 7.1

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

VC:N/VI:N/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 6000-G2 Series

  • NPort 6100-G2/6200-G2 Series
  • NPort 6400-G2 Series
  • NPort 6600-G2 Series
Firmware v1.1.0 and earlier Firmware v1.2.0 or later

 

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 June 16, 2026

Relevant Products

NPort 6100-G2/6200-G2 Series · NPort 6400-G2 Series · NPort 6600-G2 Series ·

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