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CVE-2026-27661 Siemens CVE debrief

CVE-2026-27661 is a medium-severity information disclosure vulnerability affecting Siemens SINEC Security Monitor. The vulnerability was disclosed on October 8, 2024, and subsequently assigned CVE identifier on March 10, 2026, with the advisory updated on March 12, 2026. The affected application leaks confidential information in metadata and files, including contributor information and email addresses, on the SSM Server component. This vulnerability has a CVSS 3.1 score of 4.3 (MEDIUM) with the vector AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N, indicating network-accessible attack vector with low attack complexity, requiring low privileges, with no user interaction needed, and resulting in low confidentiality impact. Siemens has released a vendor fix in version 4.9.0 or later to address this issue.

Vendor
Siemens
Product
SINEC Security Monitor
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2024-10-08
Original CVE updated
2026-03-12
Advisory published
2024-10-08
Advisory updated
2026-03-12

Who should care

Organizations operating Siemens SINEC Security Monitor in industrial control system environments should prioritize this update. Security teams responsible for OT/ICS infrastructure, network administrators managing SSM Server deployments, and compliance officers concerned with information disclosure risks should assess exposure. Organizations with regulatory requirements for protecting contributor and contact information in industrial monitoring systems should apply the vendor fix promptly.

Technical summary

The vulnerability exists in the SSM Server component of Siemens SINEC Security Monitor, where confidential information is leaked through metadata and files. Specifically, the application exposes contributor information and email addresses that should remain protected. The attack vector is network-based with low complexity, requiring only low privileges and no user interaction. The confidentiality impact is rated as low, with no integrity or availability impact. The vulnerability is classified under CWE-1230 (Exposure of Sensitive Information Through Metadata).

Defensive priority

medium

Recommended defensive actions

  • Update Siemens SINEC Security Monitor to version 4.9.0 or later to remediate the information disclosure vulnerability.
  • Review and restrict network access to SSM Server components to authorized personnel only.
  • Audit existing SSM Server deployments for exposure of sensitive metadata and contributor information.
  • Apply defense-in-depth strategies for industrial control systems as recommended by CISA.
  • Monitor for unauthorized access attempts to SSM Server metadata endpoints.

Evidence notes

The vulnerability description is sourced from CISA CSAF advisory ICSA-24-284-06, which references Siemens ProductCERT advisory SSA-430425. The CVSS vector and remediation details are explicitly documented in the CSAF source. The affected product is confirmed as SINEC Security Monitor with CSAFPID-0001 identifier.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-27661 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-27661

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

  • CVE-2026-27661 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-27661

    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/2024/icsa-24-284-06.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-430425.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-430425.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-284-06

    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.