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Vendor advisorySeverity 6.6 medium

SSA-628843: Out of Bound Read Vulnerability in TPM 2.0

SSA-628843 · Siemens · April 14, 2026

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.

From Siemens (vendor's own words, quoted), quoted as published. Check the source before acting.

What to do

Currently no fix is planned Update to V21.01.20 or later version Update to V25.02.16 or later version Update to V26.01.14 or later version

Vendor fix or mitigation, quoted from the advisory.

Each CVE in this advisory

CVESeverityKnown exploitedExploit likelihoodWeakness
CVE-2025-28846.6 mediumNo0.3%Out-of-bounds Read (CWE-125)

Severity from the advisory (CVSS), known exploitation from CISA's catalog, exploit likelihood from EPSS (next 30 days).

Affected products

VendorProductAffected versionsFixed
SiemensSIMATIC CN 4100vers:all/*—
SiemensSIMATIC Field PG M5vers:all/*—
SiemensSIMATIC Field PG M6vers:intdot/<26.01.14—
SiemensSIMATIC IPC BX-32Avers:intdot/<29.01.09—
SiemensSIMATIC IPC BX-39Avers:intdot/<29.01.09—
SiemensSIMATIC IPC BX-56Avers:intdot/<32.01.09—
SiemensSIMATIC IPC BX-59Avers:intdot/<32.01.09—
SiemensSIMATIC IPC MD-57Avers:intdot/<30.01.10—
SiemensSIMATIC IPC PX-32Avers:intdot/<29.01.09—
SiemensSIMATIC IPC PX-39Avers:intdot/<29.01.09—
SiemensSIMATIC IPC PX-39A PROvers:intdot/<29.01.09—
SiemensSIMATIC IPC RW-528Avers:intdot/<34.01.02—
SiemensSIMATIC IPC RW-548Avers:intdot/<34.01.02—
SiemensSIMATIC IPC227Evers:all/*—
SiemensSIMATIC IPC277Evers:all/*—
SiemensSIMATIC IPC427Evers:intdot/<21.01.20—
SiemensSIMATIC IPC477Evers:intdot/<21.01.20—
SiemensSIMATIC IPC477E PROvers:intdot/<21.01.20—
SiemensSIMATIC IPC627Evers:intdot/<25.02.16—
SiemensSIMATIC IPC647Evers:intdot/<25.02.16—
SiemensSIMATIC IPC677Evers:intdot/<25.02.16—
SiemensSIMATIC IPC847Evers:intdot/<25.02.16—
SiemensSIMATIC ITP1000vers:all/*—
SiemensSIPLUS IPC427Evers:intdot/<21.01.20—

Why it's on these mode pages

  • Maritime: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
  • Pipeline: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
  • Freight rail: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
  • Passenger rail and transit: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
  • Highway and motor carrier: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)
  • Postal and parcel: Vendor table: Siemens (industrial control makers used in every mode, all modes) (matched by rule)

Change history

  1. April 14, 2026: Publication Date
  2. August 11, 2026: Added no fix planned for SIMATIC ITP1000 and for SIMATIC Field PG M5. Added fix for SIMATIC Field PG M6
  3. October 13, 2026: Added fix for SIMATIC IPC627E / IPC647E / IPC677E / IPC847E
  4. November 9, 2026: First collected by Watch

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