Siemens TPM 2.0
Siemens TPM 2.0 out-of-bounds read vulnerability affects 23+ SIMATIC products.
Summary
Siemens disclosed CVE-2025-2884, an out-of-bounds read vulnerability in TPM 2.0 implementations across 23+ SIMATIC industrial control products, with CVSS 6.6 (Medium). The flaw in the CryptHmacSign helper function lacks validation between signature schemes and key algorithms, enabling information disclosure or denial of service. Siemens has released fixes for several product lines; others remain unpatched with interim countermeasures recommended.
Full text
ICS Advisory Siemens TPM 2.0 Release DateApril 21, 2026 Alert CodeICSA-26-111-01 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF Summary The products listed below contain a vulnerability that could allow an attacker to perform an out-of-bound read, potentially leading to information disclosure or denial of service of the TPM. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends countermeasures for products where fixes are not, or not yet available. The following versions of Siemens TPM 2.0 are affected: SIMATIC CN 4100 vers:all/* (CVE-2025-2884) SIMATIC Field PG M5 vers:all/* (CVE-2025-2884) SIMATIC Field PG M6 vers:all/* (CVE-2025-2884) SIMATIC IPC BX-32A vers:intdot/<29.01.09 (CVE-2025-2884) SIMATIC IPC BX-39A vers:intdot/<29.01.09 (CVE-2025-2884) SIMATIC IPC BX-56A vers:intdot/<32.01.09 (CVE-2025-2884) SIMATIC IPC BX-59A vers:intdot/<32.01.09 (CVE-2025-2884) SIMATIC IPC MD-57A vers:intdot/<30.01.10 (CVE-2025-2884) SIMATIC IPC PX-32A vers:intdot/<29.01.09 (CVE-2025-2884) SIMATIC IPC PX-39A vers:intdot/<29.01.09 (CVE-2025-2884) SIMATIC IPC PX-39A PRO vers:intdot/<29.01.09 (CVE-2025-2884) SIMATIC IPC RW-528A vers:intdot/<34.01.02 (CVE-2025-2884) SIMATIC IPC RW-548A vers:intdot/<34.01.02 (CVE-2025-2884) SIMATIC IPC227E vers:all/* (CVE-2025-2884) SIMATIC IPC277E vers:all/* (CVE-2025-2884) SIMATIC IPC427E vers:intdot/<21.01.20 (CVE-2025-2884) SIMATIC IPC477E vers:intdot/<21.01.20 (CVE-2025-2884) SIMATIC IPC477E PRO vers:intdot/<21.01.20 (CVE-2025-2884) SIMATIC IPC627E vers:all/* (CVE-2025-2884) SIMATIC IPC647E vers:all/* (CVE-2025-2884) SIMATIC IPC677E vers:all/* (CVE-2025-2884) SIMATIC IPC847E vers:all/* (CVE-2025-2884) SIMATIC ITP1000 vers:all/* (CVE-2025-2884) SIPLUS IPC427E vers:intdot/<21.01.20 (CVE-2025-2884) CVSS Vendor Equipment Vulnerabilities v3 6.6 Siemens Siemens TPM 2.0 Out-of-bounds Read Background Critical Infrastructure Sectors: Critical Manufacturing Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2025-2884 TCG TPM2.0 Reference implementation's CryptHmacSign helper function is vulnerable to Out-of-Bounds read due to the lack of validation the signature scheme with the signature key's algorithm. See Errata Revision 1.83 and advisory TCGVRT0009 for TCG standard TPM2.0 View CVE Details Affected Products Siemens TPM 2.0 Vendor:Siemens Product Version:SIMATIC CN 4100, SIMATIC Field PG M5, SIMATIC Field PG M6, SIMATIC IPC BX-32A, SIMATIC IPC BX-39A, SIMATIC IPC BX-56A, SIMATIC IPC BX-59A, SIMATIC IPC MD-57A, SIMATIC IPC PX-32A, SIMATIC IPC PX-39A, SIMATIC IPC PX-39A PRO, SIMATIC IPC RW-528A, SIMATIC IPC RW-548A, SIMATIC IPC227E, SIMATIC IPC277E, SIMATIC IPC427E, SIMATIC IPC477E, SIMATIC IPC477E PRO, SIMATIC IPC627E, SIMATIC IPC647E, SIMATIC IPC677E, SIMATIC IPC847E, SIMATIC ITP1000, SIPLUS IPC427E Product Status:known_affected Remediations No fix plannedCurrently no fix is planned None availableCurrently no fix is available Vendor fixUpdate to V21.01.20 or later versionhttps://support.industry.siemens.com/cs/ww/en/view/109763408/ Vendor fixUpdate to V29.01.09 or later versionhttps://support.industry.siemens.com/cs/ww/en/view/109763408/ Vendor fixUpdate to V30.01.10 or later versionhttps://support.industry.siemens.com/cs/ww/en/view/109763408/ Vendor fixUpdate to V32.01.09 or later versionhttps://support.industry.siemens.com/cs/ww/en/view/109763408/ Vendor fixUpdate to V34.01.02 or later versionhttps://support.industry.siemens.com/cs/ww/en/view/109763408/ Relevant CWE: CWE-125 Out-of-bounds Read Metrics CVSS Version Base Score Base Severity Vector String 3.1 6.6 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H Acknowledgments Siemens ProductCERT reported this vulnerability to CISA. General Recommendations As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity Additional Resources For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories Terms of Use The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use. Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the exploitation risk of these vulnerabilities. Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. Advisory Conversion Disclaimer This ICSA is a verbatim republication of Siemens ProductCERT SSA-628843 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact Siemens ProductCERT directly for any questions regarding this advisory. Revision History Initial Release Date: 2026-04-14 Date Revision Summary 2026-04-14 1 Publication Date 2026-04-21 2 Initial CISA Republication of Siemens ProductCERT SSA-628843 advisory Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Vendor Siemens Tags Sector: Critical Manufacturing Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Apr 21, 2026 ICS Advisory | ICSA-26-111-05 Hardy Barth Salia EV Charge Controller Apr 21, 2026 ICS Advisory | ICSA-26-111-03 Siemens SINEC NMS Apr 21, 2026 ICS Advisory | ICSA-26-111-04 Siemens A
Indicators of Compromise
- cve — CVE-2025-2884