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PatchSiren cyber security CVE debrief

CVE-2025-40737 Siemens CVE debrief

CVE-2025-40737 affects Siemens SINEC NMS and stems from improper file path validation when extracting uploaded ZIP files. A successful attack could let an attacker write arbitrary files to restricted locations and potentially execute code with elevated privileges.

Vendor
Siemens
Product
SINEC NMS
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2025-07-08
Original CVE updated
2025-07-08
Advisory published
2025-07-08
Advisory updated
2025-07-08

Who should care

Organizations running Siemens SINEC NMS, especially OT/ICS administrators, platform owners, and defenders responsible for file upload and archive processing paths.

Technical summary

The advisory states that the affected application does not properly validate file paths when extracting uploaded ZIP files. That weakness can be abused to place attacker-controlled files in restricted locations, creating a path to privilege escalation and possible code execution. The supplied CVSS data rates the issue 8.8 HIGH with vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

High. The issue is remotely reachable, requires only low attack complexity, and can affect confidentiality, integrity, and availability. Prioritize remediation for any deployed Siemens SINEC NMS instances.

Recommended defensive actions

  • Update Siemens SINEC NMS to V4.0 or later as directed by the vendor advisory.
  • Identify all exposed or internally reachable SINEC NMS instances and confirm their current version.
  • Restrict access to upload and archive-handling features to only trusted administrative workflows.
  • Review file-system permissions and service account privileges so extraction paths cannot overwrite sensitive locations.
  • Monitor for unexpected file changes, new executables, or altered application artifacts after archive processing.
  • Apply CISA-referenced industrial control system security best practices and segmentation guidance where applicable.

Evidence notes

This debrief is based on the supplied CISA CSAF advisory ICSA-25-191-01 for Siemens SINEC NMS and the referenced Siemens advisory SSA-078892. The advisory published on 2025-07-08 states: improper file path validation during ZIP extraction can allow arbitrary file writes to restricted locations and potential code execution with elevated privileges (ZDI-CAN-26571). The supplied remediation is update to V4.0 or later. No KEV enrichment was supplied for this CVE.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40737 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40737

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

  • CVE-2025-40737 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40737

    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-25-191-01.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-078892.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-078892.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-191-01

    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.