Full Report
[Control Systems] Moxa security advisory (AV26-995)
Analysis Summary
# Vulnerability: Moxa MGate Protocol Gateway Vulnerabilities
## CVE Details
- **CVE ID:** CVE-2026-86325, CVE-2026-86326
- **CVSS Score:** Not explicitly listed in the advisory (Typically high for Gateway vulnerabilities)
- **CWE:** Not specified in the brief
## Affected Systems
- **Products:** Moxa MGate Protocol Gateways
- **Versions:**
- MGate 3000 Series (Multiple versions)
- MGate 5000 Series (Multiple versions)
- **Configurations:** Systems utilizing protocol conversion features within industrial control environments.
## Vulnerability Description
The advisory identifies two distinct vulnerabilities (CVE-2026-86325 and CVE-2026-86326) affecting the firmware of MGate 3000 and 5000 series protocol gateways. While specific technical mechanics (e.g., buffer overflow, injection, or logic flaw) are not detailed in the summary, these vulnerabilities typically involve weaknesses in how the gateway handles specially crafted network packets or management interface inputs, potentially allowing for unauthorized access or service disruption.
## Exploitation
- **Status:** Not reported as exploited in the wild (as of October 2, 2026).
- **Complexity:** Medium (Standard for industrial gateway exploits).
- **Attack Vector:** Network (Likely targetable via the management web interface or protocol-specific ports).
## Impact
- **Confidentiality:** Potentially High (Access to gateway configuration and traffic).
- **Integrity:** Potentially High (Ability to modify protocol translation maps).
- **Availability:** Potentially High (Device reset or denial of service).
## Remediation
### Patches
- Users are advised to visit the Moxa Support portal to download the latest firmware updates for the MGate 3000 and 5000 series.
- Specific patch version numbers are available via the vendor's secure portal: `https[:]//www[.]moxa[.]com/en/support/product-support/security-advisory/`
### Workarounds
- **Network Segmentation:** Place MGate devices behind a firewall and isolate them from the business network/internet.
- **Access Control:** Restrict management access (HTTP/HTTPS/SNMP) to trusted IP addresses only.
- **Disable Unused Services:** Turn off protocols and services not required for operational needs.
## Detection
- **Indicators of Compromise:** Unexpected reboots of the MGate hardware, unauthorized changes to protocol conversion settings, or unusual administrative login attempts.
- **Detection methods and tools:** Monitor network traffic for anomalous packets directed at ports 80/443 or specific industrial protocol ports (e.g., Modbus TCP) originating from unknown IPs.
## References
- Moxa Security Advisory: `https[:]//www[.]moxa[.]com/en/support/product-support/security-advisory/mpsa-269540-cve-2026-86325,-cve-2026-86326-two-vulnerabilities-in-protocol-gateways`
- Canadian Centre for Cyber Security (AV26-995): `https[:]//www[.]cyber[.]gc[.]ca/en/alerts-advisories/control-systems-moxa-security-advisory-av26-995`
- Moxa RSS Feed: `https[:]//www[.]moxa[.]com/en/rss/moxa-security-advisory`