PatchSiren cyber security CVE debrief

CVE-2024-41020 Siemens CVE debrief

CVE-2024-41020 is a race condition vulnerability in the filelock component, specifically between fcntl and close operations, which can lead to issues in the recovery compatibility path. The vulnerability was published on August 12, 2025, and last modified on February 25, 2026. It affects Siemens industrial networking products including the RUGGEDCOM RST2428P and SCALANCE X-family switches running SINEC OS. The vulnerability carries a CVSS score of 5.5 (MEDIUM severity). According to CISA's advisory ICSA-25-226-07, the impact assessment for this CVE is marked as 'Misinformed' for the affected products, indicating potential discrepancies in initial reporting or analysis. The advisory has undergone multiple revisions, with the most recent update on February 25, 2026, reflecting corrections to affected product lists and clarifications to product family configurations. Organizations operating affected Siemens industrial control systems should consult the vendor's security advisory for patch availability and apply recommended mitigations following defense-in-depth practices for ICS environments.

Vendor: Siemens
Product: RUGGEDCOM RST2428P (6GK6242-6PA00)
CVSS: MEDIUM 5.5
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 networking infrastructure, particularly those with RUGGEDCOM RST2428P or SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500/XCM-/XRM-/XCH-/XRH-300 family devices in critical infrastructure environments. ICS security teams, OT engineers, and asset owners responsible for maintaining availability of industrial control networks.

Technical summary

The vulnerability exists in the filelock library's handling of file locking operations. A race condition between fcntl (file control) and close operations can cause issues in the recovery compatibility path, potentially affecting file locking reliability. This is classified under CWE-20 (Improper Input Validation). The vulnerability affects Siemens industrial networking products running SINEC OS, including RUGGEDCOM RST2428P and multiple SCALANCE X-family switch series. The 'Misinformed' impact designation in the source advisory suggests initial analysis may have been incomplete or incorrect, and organizations should verify current status with vendor guidance.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-355557 for affected product configurations and patch status
Verify SINEC OS version on deployed RUGGEDCOM RST2428P and SCALANCE X-family devices
Apply vendor-provided firmware updates when available per organizational change control procedures
Implement network segmentation for industrial control systems per CISA ICS recommended practices
Monitor CISA ICS advisories for updates to ICSA-25-226-07

Evidence notes

CVE published 2025-08-12; modified 2026-02-25. Source CISA ICSA-25-226-07, derived from Siemens ProductCERT SSA-355557. Impact marked 'Misinformed' per source threats data. Advisory revision history shows multiple updates correcting affected product listings.

Official resources

2025-08-12