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CVE-2024-53240 Siemens CVE debrief

CVE-2024-53240 is a vulnerability in the Xen netfront driver that causes a system crash when removing a device after a suspend/resume cycle. The root cause is uninitialized queues; the fix involves checking for queue existence before attempting to stop them. The vulnerability was published on 2025-08-12 and last modified on 2026-02-25. Siemens ProductCERT issued advisory SSA-355557, which CISA republished as ICSA-25-226-07. The advisory initially listed affected products but was subsequently revised on 2026-02-12 to move entries to the 'Known Not Affected' list, and further clarified on 2026-02-24 regarding affected configurations for the SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family. The final CISA republication on 2026-02-25 reflects these corrections. The threat assessment in the source material categorizes the impact as 'Misinformed' for the listed product IDs, indicating the initial affected product determinations were incorrect. No CVSS score or severity is available in the provided source corpus. This vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Vendor
Siemens
Product
RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2025-08-12
Original CVE updated
2026-02-25
Advisory published
2025-08-12
Advisory updated
2026-02-25

Who should care

Organizations operating Siemens industrial network infrastructure (SCALANCE, RUGGEDCOM families) that may incorporate Xen virtualization components; OT security teams managing firmware lifecycle for industrial switches and routers; infrastructure teams responsible for high-availability industrial networks where suspend/resume functionality is utilized.

Technical summary

The Xen netfront driver contains a vulnerability where device removal after a suspend/resume cycle triggers a crash due to uninitialized queues. The fix implements a check for queue existence before queue stop operations. This is a stability issue in paravirtualized network device handling within Xen environments.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-355557 for definitive affected product determinations, as the CISA advisory underwent multiple corrections regarding which products are actually impacted
  • Verify whether deployed Siemens industrial network devices (particularly SCALANCE and RUGGEDCOM families) utilize Xen virtualization with netfront drivers in configurations involving suspend/resume cycles
  • Apply vendor-provided firmware updates when available, prioritizing systems that cannot be mitigated through configuration changes
  • For systems where patching is not immediately feasible, assess whether suspend/resume functionality can be disabled or restricted to maintenance windows with appropriate operational controls
  • Monitor CISA ICS advisories for additional updates, as this advisory has been revised multiple times (2026-02-12, 2026-02-24, 2026-02-25) to correct affected product listings
  • Implement defense-in-depth strategies for industrial control systems per CISA recommended practices, including network segmentation and monitoring for anomalous device behavior

Evidence notes

The vulnerability description and timeline are derived from the CISA CSAF source item (ICSA-25-226-07). The vendor identification (Siemens) and product information come from the CSAF product tree with high confidence. The revision history shows multiple corrections: 2026-02-12 moved products from affected to not affected; 2026-02-24 clarified affected configurations and removed rejected CVEs; 2026-02-25 represents the latest CISA republication based on Siemens SSA-355557. The 'Misinformed' threat category indicates the initial advisory contained incorrect affected product information.

Official resources

2025-08-12