PatchSiren cyber security CVE debrief

CVE-2024-40983 Siemens CVE debrief

A vulnerability in the Transparent Inter-Process Communication (TIPC) protocol implementation could allow a crash to occur before decryption is performed. This affects Siemens industrial networking products running SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE X family switches. The vulnerability has a CVSS score of 5.5 (MEDIUM severity). CISA published this advisory on August 12, 2025, with subsequent updates through February 25, 2026, including corrections to affected product lists and clarifications on impacted configurations. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities catalog.

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

Industrial network administrators, OT security teams, and organizations deploying Siemens RUGGEDCOM or SCALANCE switches in critical infrastructure environments should prioritize assessment. Organizations with TIPC-enabled networks in manufacturing, energy, or transportation sectors should verify exposure.

Technical summary

The vulnerability exists in the TIPC (Transparent Inter-Process Communication) protocol implementation where a crash may occur before decryption operations are completed. TIPC is a cluster communication protocol used in some industrial networking environments. The crash condition suggests improper input validation or state handling during the protocol's security processing phase. Affected products include Siemens RUGGEDCOM RST2428P (6GK6242-6PA00) and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family switches running SINEC OS. The source threat assessment categorizes impact as 'Misinformed,' indicating potential for information disclosure or processing errors rather than direct code execution.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-355557 for detailed product-specific guidance and patch availability
Verify SINEC OS version on affected RUGGEDCOM RST2428P and SCALANCE X family devices
Apply vendor-provided firmware updates when available per Siemens security advisory
Monitor network traffic for anomalous TIPC protocol activity on affected industrial switches
Implement network segmentation to limit exposure of industrial control system devices
Follow CISA ICS recommended practices for defense-in-depth strategies

Evidence notes

CVE published 2025-08-12; modified 2026-02-25. Advisory ICSA-25-226-07 underwent four revisions, with the latest on 2026-02-25 republicating based on Siemens ProductCERT SSA-355557. Threat assessment marked as 'Misinformed' in source. Not in KEV.

Official resources

2025-08-12