CVE-2026-86325: Moxa Mgate MB3170 Series

Critical severity, CVSS 9.4. EPSS: 0.3% chance of exploitation in the next 30 days.

A stack-based buffer overflow vulnerability exists in protocol gateways' account management interface. The vulnerability is caused by insufficient length validation of the `account_name` parameter when processing account management requests. An attacker authenticated as a read-only user to the web management interface could supply a specially crafted account name that exceeds the size of the internal stack buffer, resulting in corruption of program execution flow. Successful exploitation could allow an attacker to read sensitive information from device memory, including credentials, modify arbitrary memory contents, and disrupt device availability.

Affected products

• Moxa Mgate MB3170 Series: from 1.0, up to and including 4.7
• Moxa Mgate MB3270 Series: from 1.0, up to and including 4.7

Published 2026-10-02. Last modified 2026-10-02.