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PatchSiren cyber security CVE debrief

CVE-2025-40898 Siemens CVE debrief

CVE-2025-40898 affects Siemens RUGGEDCOM APE1808 devices and is rated HIGH (CVSS 8.1). The issue is a path traversal weakness in the Import Arc data archive feature: an authenticated user with limited privileges can upload a specially crafted archive and potentially write arbitrary files to arbitrary paths. In practice, that can alter device configuration and may affect availability.

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 and industrial-control system operators using Siemens RUGGEDCOM APE1808, especially teams that allow authenticated users to import Arc data archives. Security, platform, and incident-response teams should treat this as a configuration-integrity and availability risk.

Technical summary

The advisory describes insufficient validation of the uploaded Arc data archive in the Import Arc data archive functionality. Because the archive content is not adequately constrained, a low-privilege authenticated user may be able to traverse directories during extraction and place files outside the intended location. The reported impact is arbitrary file write, with downstream effects including configuration tampering and service disruption. The supplied CVSS vector is AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

Defensive priority

High. The combination of authenticated access, arbitrary file write, and potential impact to device configuration and availability makes this a priority remediation item for exposed or operationally critical deployments.

Recommended defensive actions

  • Apply the vendor-provided fix referenced in Siemens ProductCERT SSA-827968 / CISA ICSA-26-015-07 as soon as operationally feasible.
  • Restrict access to archive import functions to trusted administrators only and review who can perform import operations.
  • Treat imported Arc archives as untrusted input; validate files before import and monitor for unexpected paths or filenames.
  • Back up device configurations before remediation and verify configuration integrity after any archive import activity.
  • Monitor for unauthorized configuration changes, anomalous file creation, and availability degradation on affected devices.
  • Follow Siemens and CISA industrial-control-system hardening and defense-in-depth guidance for segmentation, least privilege, and monitoring.

Evidence notes

This debrief is based only on the supplied CISA CSAF advisory data for ICSA-26-015-07 / CVE-2025-40898 and the included official references. The advisory publication date is 2026-01-13 and the latest provided update is 2026-05-14. No CISA KEV entry is indicated in the supplied corpus. The source remediation field contains a product-name inconsistency (it references Nozomi Guardian v26.2.0 while the advisory product is Siemens RUGGEDCOM APE1808), so remediation details should be verified against the vendor advisory before actioning.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40898 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40898

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

  • CVE-2025-40898 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40898

    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.