PT-2026-48857 · Moxa · Uc-1200A Series

Cyloq · Published 2026-06-12 · Updated 2026-06-12 · CVE-2026-9266

NVD

CVSS v4.0

7.0

High

Base vector

AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

A Missing Required Cryptographic Step vulnerability has been identified in Moxa's embedded Linux firmware for industrial computers and controllers. This vulnerability represents an incomplete remediation of CVE-2026-0714. The firmware introduced TPM2 parameter encryption as a countermeasure against CVE-2026-0714. However, an omission in the authorization session configuration causes the parameter encryption to provide no effective protection. An attacker with invasive physical access to the device can still capture TPM communications on the SPI bus and derive the LUKS disk encryption key in plaintext. While successful exploitation results in full compromise of the encrypted disk volume, the attack requires invasive physical access, including opening the device and attaching external equipment to the SPI bus. Remote exploitation is not possible, and the attack does not affect any downstream systems.

Fix

Weakness Enumeration

CWE-325

Related Identifiers

CVE-2026-9266

Affected Products

Uc-1200A Series

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-9266 · Security Note
• https://moxa.com/en/support/product-support/security-advisory/mpsa-266240-cve-2026-9266-missing-required-cryptographic-step-vulnerability-in-industrial-computers · Vendor Advisory