PatchSiren

PatchSiren cyber security CVE debrief

CVE-2024-27903 Siemens CVE debrief

CVE-2024-27903 is a critical issue affecting Siemens SINEMA Remote Connect Client on Windows. The advisory says OpenVPN plug-ins in OpenVPN 2.6.9 and earlier could be loaded from any directory, enabling an attacker to load an arbitrary plug-in and interact with the privileged OpenVPN interactive service.

Vendor
Siemens
Product
SINEMA Remote Connect Client
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2025-03-11
Original CVE updated
2025-03-11
Advisory published
2025-03-11
Advisory updated
2025-03-11

Who should care

Siemens SINEMA Remote Connect Client administrators, OT/industrial remote-access teams, and security operations staff responsible for Windows endpoints that use OpenVPN-based connectivity.

Technical summary

Per the CISA CSAF advisory for Siemens SINEMA Remote Connect Client, the affected Windows OpenVPN plug-in handling allows plug-ins to be loaded from arbitrary directories in OpenVPN 2.6.9 and earlier. That creates an avenue for attacker-controlled plug-in loading and interaction with a privileged OpenVPN interactive service. The provided CVSS vector is 9.8 (network, low complexity, no privileges, no user interaction, high confidentiality/integrity/availability impact). Siemens lists an update to V3.2 SP3 or later as remediation.

Defensive priority

Immediate. This is a critical, network-exploitable issue with no privileges or user interaction required and a vendor fix is available.

Recommended defensive actions

  • Identify Windows systems running Siemens SINEMA Remote Connect Client and determine whether they are affected by the OpenVPN plug-in loading issue.
  • Upgrade to Siemens SINEMA Remote Connect Client V3.2 SP3 or later as recommended by the vendor.
  • Track Siemens and CISA advisories for this product and apply the vendor remediation as part of your standard OT/ICS patch validation process.

Evidence notes

This debrief is based on the supplied CISA CSAF advisory data for ICSA-25-072-10, published 2025-03-11, which names Siemens SINEMA Remote Connect Client as the affected product and describes the OpenVPN plug-in loading issue. The supplied CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. The remediation field in the source data states: update to V3.2 SP3 or later. No additional exploitation details are included beyond the source corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-27903 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-27903

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

  • CVE-2024-27903 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-27903

    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-25-072-10.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-615740.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-615740.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-072-10

    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.