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PatchSiren cyber security CVE debrief

CVE-2025-40897 Siemens CVE debrief

CVE-2025-40897 is an access control flaw in the Threat Intelligence functionality of Siemens RUGGEDCOM APE1808. An authenticated user with view-only privileges can perform administrative actions, which can alter rules configuration and affect availability. The advisory rates the issue HIGH (CVSS 8.1) and maps it to CWE-863 (incorrect authorization).

Vendor
Siemens
Product
RUGGEDCOM APE1808
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-13
Original CVE updated
2026-07-09
Advisory published
2026-01-13
Advisory updated
2026-07-09

Who should care

OT/ICS security teams, Siemens RUGGEDCOM APE1808 administrators, and any organization that delegates view-only access to Threat Intelligence while relying on the rules configuration for operational control.

Technical summary

The supplied CISA/Siemens advisory says a specific access restriction was not properly enforced for users with view-only privileges in Threat Intelligence. Because the authorization check fails, an authenticated low-privilege user may carry out administrative actions, changing configuration and potentially disrupting availability. The advisory lists CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H and CWE-863.

Defensive priority

High

Recommended defensive actions

  • Review Threat Intelligence role assignments and confirm that view-only accounts cannot access any administrative functions.
  • Apply vendor guidance from the official Siemens/CISA advisories as soon as feasible and verify the exact affected product/update path before deployment.
  • Audit rules and configuration changes for unexpected or unauthorized modifications.
  • Restrict administrative access to the minimum necessary personnel and separate read-only and admin workflows.
  • Use CISA ICS recommended practices and defense-in-depth guidance to limit the impact of privileged-account misuse.

Evidence notes

The source advisory is CISA ICSA-26-015-07 for Siemens RUGGEDCOM APE1808, published 2026-01-13 and last updated 2026-05-14. Its revision history shows CVE-2025-40897 was added in revision 5 on 2026-05-12 and the advisory was republished in revision 6 on 2026-05-14. The supplied remediation field says 'Upgrade Nozomi Guardian to v26.2.0,' which does not match the Siemens RUGGEDCOM APE1808 advisory title; treat that remediation text cautiously and confirm against the Siemens ProductCERT references.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40897 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40897

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-40897 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40897

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-015-07.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-827968.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-827968.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-015-07

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.