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PatchSiren cyber security CVE debrief

CVE-2024-56336 Siemens CVE debrief

CVE-2024-56336 affects Siemens SINAMICS S200 and is described by CISA as an unlocked bootloader security oversight. If the bootloader is not secured, an attacker may be able to inject malicious code or install untrusted firmware, undermining the device’s protections against unauthorized access and data manipulation. The advisory was published on 2025-03-11 and rates the issue CVSS 3.1 9.8 (Critical).

Vendor
Siemens
Product
SINAMICS S200
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

OT/ICS operators, Siemens SINAMICS S200 owners, plant engineers, system integrators, and maintenance teams responsible for firmware and device trust controls.

Technical summary

According to the CISA CSAF advisory for Siemens SINAMICS S200, the affected device contains an unlocked bootloader. That condition can permit malicious firmware or code injection and weaken integrity protections. The advisory lists a CVSS v3.1 vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating severe impact if abused.

Defensive priority

Immediate priority. The issue is rated Critical (CVSS 9.8) and affects a core trust boundary for device firmware. Treat remediation and validation of device firmware controls as urgent.

Recommended defensive actions

  • Follow Siemens' published security guidance and apply defense-in-depth measures for the affected SINAMICS S200 product.
  • Contact your local Siemens customer service or support channel for product-specific remediation assistance.
  • Review device firmware handling and bootloader trust settings to ensure only authorized firmware is used.
  • Use CISA ICS recommended practices and related defense-in-depth guidance for industrial control systems.
  • Track Siemens and CISA advisory updates for any additional remediation details or follow-on notices.

Evidence notes

This debrief is based on the CISA CSAF advisory ICSA-25-072-05 and its linked Siemens product security advisory for the SINAMICS S200. The supplied source text explicitly states that the affected device contains an unlocked bootloader and that this can enable malicious code injection or untrusted firmware installation. No exploit details or unsupported impact claims were added. The supplied enrichment data does not mark this CVE as KEV-listed.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-56336 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-56336

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

  • CVE-2024-56336 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-56336

    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-25-072-05.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-787280.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-787280.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-072-05

    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.