CVE-2026-86325

Stack-based Buffer Overflow in Moxa MGate Account Management Interface

Published Oct 2, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

Moxa has developed appropriate solutions to address the vulnerability: https://www.moxa.com/en/support/product-support/security-advisory/mpsa-269540-cve-2026-86325,-cve-2026-86326-two-vulnerabilities-in-protocol-gateways

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Stack-based Buffer Overflow in Moxa MGate Account Management Interface
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Description 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.
First Time appeared Moxa
Moxa mgate Mb3170 Series
Moxa mgate Mb3270 Series
Weaknesses CWE-121
CPEs cpe:2.3:a:moxa:mgate_mb3170_series:*:*:*:*:*:*:*:*
cpe:2.3:a:moxa:mgate_mb3270_series:*:*:*:*:*:*:*:*
Vendors & Products Moxa
Moxa mgate Mb3170 Series
Moxa mgate Mb3270 Series
References
Metrics cvssV4_0

{'score': 9.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Moxa
Published
Updated
Oct 2, 2026, 10:49 AM
Reserved
Sep 7, 2026, 6:34 AM
Status
Awaiting Analysis
Published
Oct 2, 2026, 11:17 AM
Modified
Oct 2, 2026, 7:10 PM