PatchSiren cyber security CVE debrief

CVE-2024-53241 Siemens CVE debrief

CVE-2024-53241 is a vulnerability in the x86/xen PV iret hypercall implementation. The issue stems from problems with the PV iret hypercall through the hypercall page, which was addressed by directly coding the sequence in xen-asm.S to avoid complications with speculation mitigations. The vulnerability was published on 2025-08-12 and last modified on 2026-02-25. Siemens has identified this CVE as affecting certain industrial networking products, specifically the RUGGEDCOM RST2428P and SCALANCE families, though the CISA advisory marks the impact assessment as 'Misinformed' for the listed product IDs. No CVSS score or severity rating is currently available in the source data. The vulnerability originates from the Xen hypervisor codebase and impacts products that incorporate affected third-party components.

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 RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, or SCALANCE XCM-/XRM-/XCH-/XRH-300 family devices in industrial environments. Also relevant to security teams managing Xen-based virtualization infrastructure and OT/ICS security practitioners tracking third-party component vulnerabilities.

Technical summary

The vulnerability exists in the x86 Xen hypervisor's PV (paravirtualized) iret hypercall handling. The hypercall page mechanism for PV iret created issues with speculation mitigations, requiring a fix that directly codes the sequence in xen-asm.S assembly rather than using the hypercall page indirection. This is a supply-chain vulnerability where the underlying Xen component affects downstream products.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-355557 for detailed product impact assessment
Verify Xen hypervisor version in affected Siemens product deployments
Apply vendor-provided firmware updates when available
Monitor CISA ICS advisories for updated guidance
Implement network segmentation for industrial control systems per CISA recommended practices

Evidence notes

Source indicates 'Misinformed' impact classification for affected product IDs (CSAFPID-0006, CSAFPID-0002, CSAFPID-0003). Advisory underwent four revisions, with the most recent on 2026-02-25 republishing based on Siemens ProductCERT SSA-355557.

Official resources

2025-08-12