Improper Cryptographic Verification in Moxa Protocol Gateways
CVE-2026-86326

8.6HIGH

Key Information:

Vendor

Moxa
Status
Mgate Mb3170 Series
Mgate Mb3270 Series
Vendor
CVE Published:
2 October 2026

What is CVE-2026-86326?

A vulnerability exists in Moxa protocol gateways due to improper verification of cryptographic signatures on firmware images. This flaw allows an attacker with high-level privileges and access to the firmware update interface to upload a specially crafted firmware image. If successfully exploited, this could enable the attacker to execute unauthorized code, potentially compromising the device's integrity and functionality. This issue poses a significant threat as it allows for persistent malicious modifications that could survive subsequent firmware updates.

Affected Version(s)

MGate MB3170 Series 1.0

MGate MB3270 Series 1.0

References

https://www.moxa.com/en/support/product-support/security-...
vendor-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.