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CVE-2025-40735 Siemens CVE debrief

CVE-2025-40735 is a high-severity SQL injection issue affecting Siemens SINEC NMS. According to the CISA CSAF advisory and Siemens security advisory, the flaw can allow an attacker to execute arbitrary SQL queries against the server database. Siemens’ remediation is to update to V4.0 or later.

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 teams, administrators of exposed management interfaces, and security teams responsible for database-backed operational platforms.

Technical summary

The supplied advisory materials describe a SQL injection weakness in Siemens SINEC NMS. The source description states that an attacker could execute arbitrary SQL queries on the server database. The supplied CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating severe potential impact. The source materials do not list affected versions in detail beyond Siemens’ remediation guidance to update to V4.0 or later.

Defensive priority

High priority. Apply vendor remediation as soon as practical, especially where the product is reachable from less-trusted networks or supports critical OT operations.

Recommended defensive actions

  • Update Siemens SINEC NMS to V4.0 or later, per the vendor remediation guidance.
  • Restrict access to SINEC NMS management interfaces to trusted administrative networks only.
  • Review application and database logs for unusual SQL activity around the advisory date and before remediation.
  • Confirm network segmentation and other defense-in-depth controls for the management plane.
  • Use the CISA and Siemens advisory references to validate any additional environment-specific compensating controls.

Evidence notes

This debrief is based on the supplied CISA CSAF advisory ICSA-25-191-01 and the referenced Siemens advisory SSA-078892. The source metadata identifies Siemens as the vendor and SINEC NMS as the affected product. The advisory was published on 2025-07-08. The supplied narrative says the issue allows an unauthenticated remote attacker to execute arbitrary SQL queries, while the supplied CVSS vector metadata includes PR:L; both facts are preserved here as source material. No KEV entry was supplied.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40735 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40735

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

  • CVE-2025-40735 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40735

    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.