PatchSiren

PatchSiren cyber security CVE debrief

CVE-2025-40574 Siemens CVE debrief

CVE-2025-40574 is a high-severity local authorization issue affecting Siemens SCALANCE LPE9403 (6GK5998-3GS00-2AC2). According to the CISA/Siemens advisory, affected devices do not properly assign permissions to critical resources, which could let a non-privileged local attacker interact with the backupmanager service. The advisory states that no fix was available at publication, so risk reduction depends on access restriction and other defensive controls.

Vendor
Siemens
Product
SCALANCE LPE9403 (6GK5998-3GS00-2AC2)
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2025-05-13
Original CVE updated
2025-05-13
Advisory published
2025-05-13
Advisory updated
2025-05-13

Who should care

OT operators, industrial network administrators, Siemens SCALANCE LPE9403 owners, and incident responders responsible for on-premises device access control and hardening.

Technical summary

The source advisory describes a permissions/authorization weakness on Siemens SCALANCE LPE9403. The attack vector is local, with low privileges and no user interaction required (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The affected component named in the advisory is the backupmanager service. Because the advisory says no fix is currently available, exposure should be reduced through strict local-access controls and OT defense-in-depth measures.

Defensive priority

High. The CVSS score is 7.8, the attacker only needs local low-privilege access, and the advisory indicates no patch was available at publication.

Recommended defensive actions

  • Restrict access to SCALANCE LPE9403 devices to authorized and trusted personnel only, as recommended in the advisory.
  • Review and minimize who can obtain local or administrative access to affected devices; remove unnecessary access paths where possible.
  • Apply OT defense-in-depth controls such as segmentation and least-privilege administration, using CISA ICS recommended practices.
  • Track Siemens and CISA advisory updates for any future fix or revised mitigation guidance and plan remediation when available.

Evidence notes

This debrief is based only on the supplied CISA CSAF advisory ICSA-25-135-18 and the linked Siemens/CISA references. The source explicitly identifies Siemens SCALANCE LPE9403 as the affected product, describes the issue as improper assignment of permissions to critical resources, names backupmanager as the service a non-privileged local attacker could interact with, and states that no fix was available at publication. The published and modified dates supplied for the CVE and source are both 2025-05-13.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40574 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40574

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

  • CVE-2025-40574 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40574

    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/2025/icsa-25-135-18.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-327438.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-327438.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-135-18

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/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://us-cert.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.