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PatchSiren cyber security CVE debrief

CVE-2024-39866 Siemens CVE debrief

CVE-2024-39866 is a HIGH severity vulnerability (CVSS 8.8) in Siemens SINEMA Remote Connect Server, published July 9, 2024. The vulnerability allows an attacker with access to the backup encryption key and upload privileges to create administrative users by uploading malicious encrypted backup files. The attack vector is network-based with low attack complexity, requiring low privileges but no user interaction. Siemens has released a vendor fix in version V3.2 SP1 or later.

Vendor
Siemens
Product
SINEMA Remote Connect Server
CVSS
HIGH 8.8
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 those in critical infrastructure sectors. Security teams responsible for OT/ICS environments, system administrators managing remote connectivity solutions, and compliance officers overseeing industrial cybersecurity frameworks should prioritize this vulnerability.

Technical summary

The affected application permits users to upload encrypted backup files. An attacker possessing the backup encryption key and upload privileges can craft a malicious backup file that, when restored, creates a user account with administrative privileges. This represents a privilege escalation vulnerability with network attack vector, low complexity, and high impact on confidentiality, integrity, and availability.

Defensive priority

HIGH

Recommended defensive actions

  • Update SINEMA Remote Connect Server to V3.2 SP1 or later version
  • Restrict backup upload privileges to authorized personnel only
  • Protect backup encryption keys with appropriate access controls
  • Monitor for unauthorized backup upload activities
  • Review administrative user accounts for unauthorized creation
  • Apply defense-in-depth strategies for industrial control systems per CISA guidance

Evidence notes

CVE published and modified 2024-07-09 per official record. CISA CSAF advisory ICSA-24-193-01 published same date. Vendor fix available: update to V3.2 SP1 or later.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-39866 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-39866

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

  • CVE-2024-39866 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-39866

    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.