PatchSiren cyber security CVE debrief

CVE-2023-52843 Siemens CVE debrief

This CVE addresses a vulnerability in the Linux kernel's Logical Link Control (LLC) protocol implementation. The issue involves insufficient validation of MAC header length before reading the MAC header, which could lead to out-of-bounds memory access. The vulnerability was resolved by adding proper verification of the MAC length prior to header access. Siemens has identified this vulnerability as affecting certain industrial networking products running SINEC OS, including the RUGGEDCOM RST2428P and SCALANCE X-family switches. CISA published this advisory on August 12, 2025, with subsequent updates through February 25, 2026, including corrections to affected product listings and removal of rejected CVEs. The advisory was republished based on Siemens ProductCERT advisory SSA-613116.

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 networking infrastructure, particularly those using SCALANCE switches or RUGGEDCOM devices in critical infrastructure environments. Security teams responsible for OT/ICS network security should prioritize firmware updates and network segmentation controls.

Technical summary

The vulnerability exists in the Linux kernel's LLC (Logical Link Control, IEEE 802.2) protocol implementation. The code failed to verify that the MAC header length was sufficient before attempting to read the MAC header, potentially resulting in out-of-bounds memory reads. The fix adds proper length validation before header access operations. This vulnerability affects Siemens industrial networking products utilizing SINEC OS, specifically the RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family and XCM-/XRM-/XCH-/XRH-300 family switches. The CISA advisory classifies the impact as 'Misinformed' for affected products.

Defensive priority

medium

Recommended defensive actions

Review Siemens ProductCERT advisory SSA-613116 for specific product impact and patch availability
Verify SINEC OS version on affected Siemens SCALANCE and RUGGEDCOM devices
Apply vendor-provided firmware updates when available per Siemens advisory
Implement network segmentation for industrial control systems per CISA recommended practices
Monitor CISA ICS advisories for additional updates to this vulnerability

Evidence notes

Vulnerability description sourced from CISA CSAF advisory ICSA-25-226-15. The source indicates this vulnerability was resolved in the Linux kernel LLC implementation. Siemens ProductCERT advisory SSA-613116 is the canonical source for product impact. Timeline derived from CSAF revision history: initial publication 2025-08-12, updated 2026-02-12 (product corrections), 2026-02-24 (removed rejected CVEs), 2026-02-25 (CISA republication).

Official resources

2025-08-12