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ICSA-26-111-01: Siemens TPM 2.0 ↗ source

April 21, 2026 CISA ICS Advisory

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. 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

Advisory Details CISA ICS CSAF feed

Advisory ID
ICSA-26-111-01
Status
Final · version 2
Initial release
2026-04-14
Last revised
2026-04-21 (2 revisions)
Vendor
Siemens
Critical infrastructure sectors
Critical Manufacturing
Deployed
Worldwide
Vendor headquarters
Germany

Republished vendor advisory. 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…

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

Credit: Siemens ProductCERT

Affected products (24)
  • SIMATIC CN 4100 — all versions
  • SIMATIC Field PG M5 — all versions
  • SIMATIC Field PG M6 — all versions
  • SIMATIC IPC BX-32A — <29.01.09
  • SIMATIC IPC BX-39A — <29.01.09
  • SIMATIC IPC BX-56A — <32.01.09
  • SIMATIC IPC BX-59A — <32.01.09
  • SIMATIC IPC MD-57A — <30.01.10
  • SIMATIC IPC PX-32A — <29.01.09
  • SIMATIC IPC PX-39A — <29.01.09
  • SIMATIC IPC PX-39A PRO — <29.01.09
  • SIMATIC IPC RW-528A — <34.01.02
  • SIMATIC IPC RW-548A — <34.01.02
  • SIMATIC IPC227E — all versions
  • SIMATIC IPC277E — all versions
  • SIMATIC IPC427E — <21.01.20
  • SIMATIC IPC477E — <21.01.20
  • SIMATIC IPC477E PRO — <21.01.20
  • SIMATIC IPC627E — all versions
  • SIMATIC IPC647E — all versions
  • SIMATIC IPC677E — all versions
  • SIMATIC IPC847E — all versions
  • SIMATIC ITP1000 — all versions
  • SIPLUS IPC427E — <21.01.20
Revision history (2)
  • 2026-04-21 — v2: Initial CISA Republication of Siemens ProductCERT SSA-628843 advisory
  • 2026-04-14 — v1: Publication Date

From CISA's machine-readable CSAF 2.0 advisory (JSON).

Vulnerabilities as Stated by the Advisory

CVEWeaknessCVSS v3Details
CVE-2025-2884 CWE-125 Out-of-bounds Read 6.6 Medium 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

No fix planned: Currently no fix is planned

No fix available: Currently no fix is available

Vendor fix: Update to V21.01.20 or later version ↗

Affected, fixed & timeline

Affected:

  • SIMATIC CN 4100 all versions
  • SIMATIC Field PG M5 all versions
  • SIMATIC Field PG M6 all versions
  • SIMATIC IPC BX-32A <29.01.09
  • SIMATIC IPC BX-39A <29.01.09
  • SIMATIC IPC BX-56A <32.01.09
  • SIMATIC IPC BX-59A <32.01.09
  • SIMATIC IPC MD-57A <30.01.10
  • SIMATIC IPC PX-32A <29.01.09
  • SIMATIC IPC PX-39A <29.01.09
  • SIMATIC IPC PX-39A PRO <29.01.09
  • SIMATIC IPC RW-528A <34.01.02
  • SIMATIC IPC RW-548A <34.01.02
  • SIMATIC IPC227E all versions
  • SIMATIC IPC277E all versions
  • … and 9 more

Vendor fix: Update to V29.01.09 or later version

Vendor fix: Update to V30.01.10 or later version

Vendor fix: Update to V32.01.09 or later version

Vendor fix: Update to V34.01.02 or later version

Scores and weakness types are as CISA or the republishing vendor stated them in this advisory; the linked CVE pages carry the independently enriched CVSS and SSVC assessments.

News Coverage

No coverage found in monitored research blogs or news feeds.

CVEs Referenced in This Publication

CVECVSSAffected
CVE-2025-2884 6.6 Medium Trusted Computing Group TPM2.0 TCG TPM2.0 Reference implementation's CryptHmacSign helper function is vulnerable to Out-of-Bounds read due to the lack of validation the signature s…

Named by the advisory itself. Each CVE links to its tracked detail page.

Vendors Named in This Publication

Each vendor links to its Known Exploited Vulnerabilities catalog page. Only vendors that appear in the KEV catalog are listed, either because the publication cites one of their KEV entries or because it names them directly.