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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.

Official resources

Publicly disclosed by CISA on 2025-03-11 through ICSA-25-072-05; not listed as KEV in the provided data.