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CVE-2025-40583 Siemens CVE debrief

CVE-2025-40583 is a confidentiality issue affecting Siemens SCALANCE LPE9403 (6GK5998-3GS00-2AC2). The advisory says affected devices transmit sensitive information in cleartext, which could let a privileged local attacker retrieve that information. Siemens and CISA list no fix at the time of publication, so access controls are the primary defense.

Vendor
Siemens
Product
SCALANCE LPE9403 (6GK5998-3GS00-2AC2)
CVSS
MEDIUM 6.7
CISA KEV
Not listed in stored evidence
Original CVE published
2025-05-13
Original CVE updated
2026-09-08
Advisory published
2025-05-13
Advisory updated
2026-09-08

Who should care

OT and industrial control system operators using Siemens SCALANCE LPE9403, especially environments where privileged local access is shared, loosely controlled, or difficult to audit.

Technical summary

The advisory describes cleartext transmission of sensitive information on the affected device. The stated impact is limited to confidentiality: a privileged local attacker may retrieve sensitive information, while integrity and availability are not listed as impacted. The supplied CVSS vector is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N, which aligns with a local attack requiring high privileges.

Defensive priority

Medium priority. Treat as important where local administrative access is not tightly restricted, because the exposure is confidentiality-focused but requires privileged local access and no vendor fix is currently available.

Recommended defensive actions

  • Restrict device access to authorized and trusted personnel only, as recommended by the advisory.
  • Review and tighten privileged local access controls on systems that can reach the SCALANCE LPE9403.
  • Limit physical and administrative access to the device and its management environment.
  • Follow Siemens and CISA advisory updates for any future remediation or firmware guidance.
  • Apply CISA industrial control systems recommended-practices guidance for defense in depth and access control.

Evidence notes

Based on the Siemens/CISA advisory for ICSA-25-135-18, the affected product is Siemens SCALANCE LPE9403 (6GK5998-3GS00-2AC2). The advisory text states that affected devices transmit sensitive information in cleartext and that a privileged local attacker could retrieve it. The remediation section states that no fix is currently available and recommends restricting access to authorized and trusted personnel. Publication date used here is 2025-05-13, matching the supplied CVE and source advisory dates.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40583 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40583

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

  • CVE-2025-40583 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40583

    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.