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CVE-2024-39869 Siemens CVE debrief

CVE-2024-39869 is a medium-severity vulnerability (CVSS 6.5) affecting Siemens SINEMA Remote Connect Server, published on 2024-07-09. The vulnerability allows an authenticated attacker to upload a crafted certificate that results in a permanent denial-of-service condition. Recovery requires manual removal of the offending certificate. The attack vector is network-based with low attack complexity, requiring low privileges and no user interaction. Siemens has released a vendor fix in version V3.2 SP1 or later. CISA published advisory ICSA-24-193-01 on the same date as the CVE publication.

Vendor
Siemens
Product
SINEMA Remote Connect Server
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2024-07-09
Original CVE updated
2024-07-09
Advisory published
2024-07-09
Advisory updated
2024-07-09

Who should care

Organizations operating Siemens SINEMA Remote Connect Server for remote access to industrial control systems, particularly in critical infrastructure sectors. Security teams responsible for OT/ICS environments, network administrators managing remote connectivity solutions, and incident response teams supporting industrial automation environments should prioritize this patch.

Technical summary

The vulnerability exists in the certificate upload functionality of SINEMA Remote Connect Server. An authenticated attacker can exploit this by uploading a malformed or crafted certificate that causes a permanent denial-of-service condition. The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) indicates network accessibility, low attack complexity, low privilege requirements, no user interaction, and high impact to availability. The permanent nature of the DoS requires administrative intervention to remove the malicious certificate.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor fix by updating SINEMA Remote Connect Server to V3.2 SP1 or later version
  • Review and restrict certificate upload permissions to minimize attack surface
  • Implement network segmentation for industrial control systems per CISA recommended practices
  • Monitor for unauthorized certificate uploads in system logs
  • Establish incident response procedures for manual certificate removal if exploitation is suspected

Evidence notes

Vulnerability description and remediation details sourced from CISA CSAF advisory ICSA-24-193-01 and Siemens security advisory SSA-381581. CVSS vector confirms network attack vector with low complexity and high availability impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-39869 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-39869

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

  • CVE-2024-39869 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-39869

    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-24-193-01.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-381581.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-381581.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/pdf/ssa-381581.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/txt/ssa-381581.txt

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-193-01

    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

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.