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ICSA-25-148-01: Siemens SiPass ↗ source

May 28, 2025 CISA ICS Advisory

Summary

SiPass integrated ACC (Advanced Central Controller) devices do not properly check the integrity of firmware updates. This could allow an attacker to upload a maliciously modified firmware onto the device. Siemens recommends specific countermeasures for products where fixes are not, or not yet available. CVE-2022-31807: Affected devices do not properly check the integrity of firmware updates. This could allow a local attacker to upload a maliciously modified firmware onto the device. In a second scenario, a remote attacker who is able to intercept the transfer of a valid firmware from the server to the device could modify the firmware "on the fly".

Advisory Details CISA ICS CSAF feed

Advisory ID
ICSA-25-148-01
Status
Final · version 2
Initial release
2025-05-23
Last revised
2025-10-14 (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-367714 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 affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.

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 (2)
  • SiPass integrated AC5102 (ACC-G2) — all versions
  • SiPass integrated ACC-AP — all versions
Revision history (2)
  • 2025-10-14 — v2: Clarified that currently no fix is planned for affected devices
  • 2025-05-23 — v1: Publication Date

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

Vulnerabilities as Stated by the Advisory

CVEWeaknessCVSS v3Details
CVE-2022-31807 CWE-347 Improper Verification of Cryptographic Signature 6.2 Medium CVE-2022-31807
Affected devices do not properly check the integrity of firmware updates. This could allow a local attacker to upload a maliciously modified firmware onto the device. In a second scenario, a remote attacker who is able to intercept the transfer of a valid firmware from the server to the device could modify the firmware "on the fly".

Mitigation: Enable TLS for communication between servers and affected devices; this mitigates the risk of on-path attackers that intercept and modify the firmware during transmission

No fix planned: Currently no fix is planned

Affected, fixed & timeline

Affected:

  • SiPass integrated AC5102 (ACC-G2) all versions
  • SiPass integrated ACC-AP all versions

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-2022-31807 6.2 Medium Siemens Building X - Security Manager Edge Controller (ACC-AP) A vulnerability has been identified in Building X - Security Manager Edge Controller (ACC-AP) (All versions). Affected devices do not properly check …

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.