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CVE-2025-40578 Siemens CVE debrief

Published on 2025-05-13, CVE-2025-40578 affects Siemens SCALANCE LPE9403 (6GK5998-3GS00-2AC2). An unauthenticated attacker on an adjacent network can send multiple Profinet packets in rapid succession, which can crash the dcpd process. CISA rates the issue CVSS 4.3/Medium and reports that no fix is currently available.

Vendor
Siemens
Product
SCALANCE LPE9403 (6GK5998-3GS00-2AC2)
CVSS
MEDIUM 4.3
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/ICS operators, network engineers, and security teams responsible for Siemens SCALANCE LPE9403 deployments, especially where Profinet and DCP are reachable on industrial networks.

Technical summary

The advisory says affected devices do not properly handle multiple incoming Profinet packets received in rapid succession. The result is a crash of the dcpd process caused by an unauthenticated remote attacker. The supplied CVSS vector is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L, indicating availability-only impact with adjacent-network attack requirements. CISA identifies the affected product as Siemens SCALANCE LPE9403 (6GK5998-3GS00-2AC2) and states that no fix is currently available.

Defensive priority

Moderate priority for exposed OT networks. Because the flaw is remotely triggerable from an adjacent network and no patch is available in the supplied advisory, exposure reduction and service mitigation should be prioritized.

Recommended defensive actions

  • Disable the Profinet Discovery and Configuration Protocol (DCP) service on affected devices, per the advisory.
  • Reduce exposure of affected devices by segmenting OT networks and limiting reachability from other systems.
  • Apply CISA ICS recommended practices and defense-in-depth guidance to reduce the impact of a device crash.
  • Monitor Siemens and CISA advisory updates for any future fix or additional mitigation guidance.
  • Coordinate any DCP changes with operational stakeholders before implementation.

Evidence notes

Primary evidence comes from the CISA CSAF advisory ICSA-25-135-18 and the Siemens advisory references SSA-327438. The supplied source states that rapid successive Profinet packets can crash dcpd, identifies Siemens SCALANCE LPE9403 as affected, and lists no fix available at publication time.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40578 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40578

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

  • CVE-2025-40578 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40578

    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.