Siemens SIMATIC IPCs: 1 CVE, High 7.7
Summary
CISA reports 1 vulnerability in Siemens SIMATIC IPC BX-21A, SIMATIC IPC RW-543A, SIMATIC IPC227G / IPC277G / IPC277G PRO / IPC327G / IPC377G. Weakness type: Use of Default Cryptographic Key. 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. Highest CVSS v3 score: 7.7 (High), not remotely exploitable per its CVSS vector.
At a glance
- Vendor
- Siemens
- Products
- SIMATIC IPC BX-21A, SIMATIC IPC RW-543A, SIMATIC IPC227G / IPC277G / IPC277G PRO / IPC327G / IPC377G
- CVEs
- CVE-2026-72895
- Highest CVSS v3
- 7.7 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
- Highest CVSS v4
- –
- Known exploited (KEV)
- No CVE from this advisory is on the KEV list as of the last refresh
- Sectors (per CISA)
- Critical Manufacturing, Transportation Systems, Energy, Healthcare and Public Health, Financial Services, Government Services and Facilities
- Deployed
- Worldwide
- Vendor HQ
- Germany
Vulnerabilities
| CVE | Weakness | CVSS v3 | CVSS v4 | KEV | Description (from advisory) |
|---|---|---|---|---|---|
| CVE-2026-72895 | Use of Default Cryptographic Key | 7.7 | – | No | CVE-2026-72895 |
Affected products (3)
- SIMATIC IPC BX-21A < V31.01.13
- SIMATIC IPC RW-543A < V1.1.4
- SIMATIC IPC227G / IPC277G / IPC277G PRO / IPC327G / IPC377G < V28.01.15
Vendor fixes and mitigations (from advisory)
- Mitigation: <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: <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 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.
- Vendor Fix: Update to V1.1.4 or later version link
- Vendor Fix: Update to V28.01.15 or later version link
- Vendor Fix: Update to V31.01.13 or later version link
Also apply CISA's standard ICS practices: minimize network exposure, keep control networks behind firewalls and isolated from business networks, and use up-to-date secure remote access.
Sources
- CISA advisory ICSA-26-295-07
- Machine-readable CSAF record
- https://cert-portal.siemens.com/productcert/csaf/ssa-159454.json
- https://cert-portal.siemens.com/productcert/html/ssa-159454.html
This page is generated automatically from the CISA advisory text. It is not a substitute for the vendor's guidance; verify affected versions and fixes at the source before making changes to control systems.