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PatchSiren cyber security CVE debrief

CVE-2025-40831 Siemens CVE debrief

CVE-2025-40831 affects Siemens SINEC Security Monitor and is described as a missing input-validation flaw in report generation date handling. An authenticated, low-privileged attacker can trigger a denial-of-service condition in the report functionality. The advisory rates the issue CVSS 6.5 (MEDIUM) and limits the documented impact to availability. Siemens' fix is available in V4.10.0 or later. CISA published the advisory on 2025-12-09 and republished it on 2026-01-14 after incorporating Siemens ProductCERT material.

Vendor
Siemens
Product
SINEC Security Monitor
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2025-12-09
Original CVE updated
2026-01-14
Advisory published
2025-12-09
Advisory updated
2026-01-14

Who should care

Administrators and operators of Siemens SINEC Security Monitor, especially teams that rely on report generation for operational workflows. Security and vulnerability management teams should prioritize environments where authenticated users with limited privileges can access reporting features.

Technical summary

The advisory states that the affected application lacks input validation for a date parameter used in report generation. That weakness can be abused by an authenticated user with low privileges to cause a denial-of-service condition in the reporting function. The provided CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating network reachability, low attack complexity, and availability impact only.

Defensive priority

Medium. Patch promptly, but the issue is scoped to report generation rather than a documented full-service compromise. Prioritize faster remediation if reporting is business-critical or exposed to many authenticated users.

Recommended defensive actions

  • Update Siemens SINEC Security Monitor to V4.10.0 or later.
  • Review which authenticated accounts can access report-generation features and remove unnecessary low-privilege access where possible.
  • Monitor the application for repeated report-generation failures or service disruptions.
  • Apply standard ICS defense-in-depth controls and keep vendor and CISA advisories under watch for any updates.

Evidence notes

All claims are taken from the supplied CISA CSAF advisory data and its referenced Siemens ProductCERT advisory. The source explicitly describes missing date-parameter input validation in report generation, an authenticated low-privilege denial-of-service impact, CVSS 6.5, and the remediation target of V4.10.0 or later. The supplied corpus does not include a Known Exploited Vulnerabilities listing or any additional exploitation details.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40831 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40831

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

  • CVE-2025-40831 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40831

    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/2026/icsa-26-015-06.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-882673.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-882673.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-015-06

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/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://www.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.