Full Report
[Control Systems] Moxa security advisory (AV26-594)
Analysis Summary
# Vulnerability: Missing Required Cryptographic Step in Moxa Industrial Computers
## CVE Details
- **CVE ID:** CVE-2026-9266
- **CVSS Score:** Not explicitly listed in the advisory summary, but typically rated **High** for cryptographic failures in industrial controllers.
- **CWE:** CWE-325: Missing Required Cryptographic Step
## Affected Systems
- **Products:**
- UC-1200A / UC-2200A / UC-3400A / UC-4400A / UC-8200 Series
- V1200 Series
- V3200 / V3400 Series
- V2406C WL Models
- **Versions:**
- V1200 Series: Version v1.2.0 and prior
- V3200 / V3400 Series: Version v1.1 and prior
- V2406C WL Models: Version v1.2 and prior
- UC Series: Multiple versions and models (Check specific firmware build against vendor site)
- **Configurations:** Systems utilizing default or unhardened cryptographic configurations for secure communication or data storage.
## Vulnerability Description
This vulnerability arises from a failure to implement a necessary step in a cryptographic algorithm or protocol. In the context of Moxa's industrial computers, this could involve the failure to properly salt hashes, verify certificates, or initialize encryption vectors. This flaw may allow an attacker to bypass security mechanisms, decrypt sensitive information, or perform man-in-the-middle (MitM) attacks on management traffic.
## Exploitation
- **Status:** Not reported as exploited in the wild; PoC availability is currently restricted.
- **Complexity:** Medium (Requires technical knowledge of the specific cryptographic implementation).
- **Attack Vector:** Network (Generally targetable via the management interface or communication protocols over the network).
## Impact
- **Confidentiality:** High (Potential for unauthorized data decryption).
- **Integrity:** High (Potential for unauthorized modification of data or configurations).
- **Availability:** Medium (Potential session disruption).
## Remediation
### Patches
Moxa recommends updating to the following firmware versions or later:
- **V1200 Series:** Upgrade to v1.2.1 or higher.
- **V3200 / V3400 Series:** Upgrade to v1.2 or higher.
- **V2406C WL Models:** Upgrade to v1.3 or higher.
- **UC Series:** Consult the Moxa advisory portal for the specific firmware update corresponding to your exact model (e.g., UC-8200).
### Workarounds
- **Network Segmentation:** Place industrial computers behind firewalls and isolate them from the public internet.
- **Secure Management:** Use VPNs or encrypted tunnels for remote management to compensate for the underlying cryptographic weakness until patches are applied.
- **Access Control:** Restrict access to the device management interfaces to trusted IP addresses only.
## Detection
- **Indicators of Compromise:** Monitor for unusual administrative login attempts or unauthorized changes to device configurations.
- **Detection Methods:** Security teams should use vulnerability scanners to identify outdated firmware versions on Moxa assets.
## References
- **Vendor Advisory:** hxxps[://]www[.]moxa[.]com/en/support/product-support/security-advisory/mpsa-266240-cve-2026-9266-missing-required-cryptographic-step-vulnerability-in-industrial-computers
- **Moxa Security Portal:** hxxps[://]www[.]moxa[.]com/en/support/product-support/security-advisory
- **Canadian Centre for Cyber Security Advisory:** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/control-systems-moxa-security-advisory-av26-594