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SSA-159454: Hard-coded Key Vulnerability in SIMATIC IPCs

HIGH
CVSS 7.7
Date 2026-10-13T00:00:00+00:00
Source siemens-productcert
Published by Siemens ProductCERT

// Description

The products listed below contain a vulnerability that could allow an attacker to boot an operating system or UEFI application signed with that test key, bypassing UEFI Secure Boot protections even when Secure Boot is enabled. Siemens has released new versions for the affected products and recommends to update to the latest versions.

// Vulnerabilities (1)

CVE ID CVSS Score Severity Description
CVE-2026-72895 7.7 high
CVE-2026-72895. A BIOS vendor test key is present in the UEFI Secure Boot key database. This could allow a local attacker with physical or administrative access to the device to boot an operating system or UEFI application signed with that test key, bypassing UEFI Secure Boot protections even when Secure Boot is enabled, potentially leading to a full loss of confidentiality, integrity, and availability of the device.

// Remediations (6)

Patch: Update to V28.01.15 or later version
Update to V28.01.15 or later version
Patch: Update to V31.01.13 or later version
Update to V31.01.13 or later version
Mitigation: <br/>Note: After upgrading to the fixed BIOS version, users must load the BIOS default settings. If
<br/>Note: After upgrading to the fixed BIOS version, users must load the BIOS default settings. If Secure Boot keys were already provisioned, they must be provisioned again afterwards.
Mitigation: As a temporary mitigation, users can manually remove the test key from the database (e.g., "DO NOT T
As a temporary mitigation, users can manually remove the test key from the database (e.g., "DO NOT TRUST - AMI Test PK" for RW-543A or "insyde-ElkhartLake" for IPC227G/277G/327G/377G and BX-21A). Note: Loading default settings will restore the test key, so upgrading remains recommended.
Mitigation: <br/>Note: After upgrading to the fixed BIOS version, users must load the BIOS default settings. If
<br/>Note: After upgrading to the fixed BIOS version, users must load the BIOS default settings. If Secure Boot keys were already provisioned, they must be provisioned again afterwards.
Patch: Update to V1.1.4 or later version
Update to V1.1.4 or later version

// References