Description
An improper verification of cryptographic signature vulnerability exists in protocol gateways because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privileges and access to the firmware update interface could provide a specially crafted or modified firmware image, causing it to be installed on the device. Successful exploitation could allow the attacker to execute unauthorized code, compromise the integrity and availability of the device, and persist malicious modifications across subsequent firmware updates.
Published: 2026-10-02
Score: 8.6 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

Users are advised to follow the applicable Security Hardening Guide for the MGate MB3000 or MGate 5000 Series when obtaining and updating firmware. The guides provide recommendations for securely obtaining firmware from official Moxa sources and performing firmware updates. Users should follow the applicable guidance to ensure that the correct and trusted firmware is obtained and that firmware updates are performed securely. For detailed mitigation guidance, please refer to the following Security Hardening Guides: * The Security Hardening Guide for the MGate 5000 Series * The Security Hardening Guide for the MGate MB3000 Series

Tracking

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Advisories

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History

Fri, 02 Oct 2026 12:00:00 +0000

Type Values Removed Values Added
Title Improper Cryptographic Signature Verification in Moxa MGate Firmware Update

Fri, 02 Oct 2026 11:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 02 Oct 2026 10:30:00 +0000

Type Values Removed Values Added
Description An improper verification of cryptographic signature vulnerability exists in protocol gateways because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privileges and access to the firmware update interface could provide a specially crafted or modified firmware image, causing it to be installed on the device. Successful exploitation could allow the attacker to execute unauthorized code, compromise the integrity and availability of the device, and persist malicious modifications across subsequent firmware updates.
First Time appeared Moxa
Moxa mgate Mb3170 Series
Moxa mgate Mb3270 Series
Weaknesses CWE-347
CPEs cpe:2.3:a:moxa:mgate_mb3170_series:1.0:*:*:*:*:*:*:*
cpe:2.3:a:moxa:mgate_mb3270_series:1.0:*:*:*:*:*:*:*
Vendors & Products Moxa
Moxa mgate Mb3170 Series
Moxa mgate Mb3270 Series
References
Metrics cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

Moxa Mgate Mb3170 Series Mgate Mb3270 Series
cve-icon MITRE

Status: PUBLISHED

Assigner: Moxa

Published:

Updated: 2026-10-02T10:39:59.785Z

Reserved: 2026-09-07T06:34:04.814Z

Link: CVE-2026-86326

cve-icon Vulnrichment

Updated: 2026-10-02T10:38:28.855Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-02T11:17:36.330

Modified: 2026-10-02T19:10:09.143

Link: CVE-2026-86326

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-02T14:44:35Z

Weaknesses
  • CWE-347

    Improper Verification of Cryptographic Signature