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PatchSiren cyber security CVE debrief

CVE-2024-39867 Siemens CVE debrief

A high-severity authentication bypass vulnerability in Siemens SINEMA Remote Connect Server allows unauthenticated attackers to access and modify device configurations for which they lack authorization. The flaw stems from improper authentication validation during specific web interface actions. Published July 9, 2024, this vulnerability carries a CVSS 3.1 score of 7.6 (HIGH severity). Siemens has released a vendor fix in version V3.2 SP1 or later. Organizations should prioritize patching, especially for internet-exposed management interfaces, and implement network segmentation to limit attack surface.

Vendor
Siemens
Product
SINEMA Remote Connect Server
CVSS
HIGH 7.6
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 industrial network management, particularly those with web interfaces exposed to broader network segments. Critical infrastructure operators, manufacturing facilities, and utilities using this platform for secure remote access to OT environments should prioritize assessment and patching.

Technical summary

The vulnerability exists in the web interface of SINEMA Remote Connect Server where certain actions fail to properly validate authentication state. An unauthenticated attacker can exploit this flaw to access device configuration information and perform unauthorized edits on devices beyond their privilege scope. The attack requires network access to the web interface with low complexity and no user interaction. The CVSS vector indicates high availability impact alongside confidentiality and integrity impacts, suggesting potential for service disruption through configuration tampering.

Defensive priority

high

Recommended defensive actions

  • Apply vendor patch: Update SINEMA Remote Connect Server to V3.2 SP1 or later version as specified in Siemens security advisory
  • Restrict network access: Limit web interface exposure to trusted administrative networks only; avoid internet-facing deployments where possible
  • Review access logs: Examine web interface access logs for unauthorized configuration changes or anomalous access patterns prior to patching
  • Implement defense in depth: Apply CISA ICS recommended practices for network segmentation and industrial control system security
  • Verify configuration integrity: After patching, audit device configurations to ensure no unauthorized modifications were made

Evidence notes

Authentication bypass confirmed in CISA ICS advisory ICSA-24-193-01 and Siemens security advisory SSA-381581. CVSS vector AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H indicates network attack vector with low attack complexity, low privileges required, and high availability impact. Remediation guidance specifies update to V3.2 SP1 or later.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-39867 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-39867

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

  • CVE-2024-39867 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-39867

    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.