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CVE-2024-49933 Siemens CVE debrief

CVE-2024-49933 is a medium-severity vulnerability (CVSS 5.5) affecting the blk_iocost component in the Linux kernel, specifically involving out-of-bounds shift operations. The vulnerability was published on August 12, 2025, and last modified on February 25, 2026. Siemens has identified this vulnerability as affecting multiple industrial networking products including the RUGGEDCOM RST2428P, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family, and SCALANCE XCM-/XRM-/XCH-/XRH-300 family. The vulnerability is classified under CWE-20 (Improper Input Validation). Siemens has provided vendor fixes, with updates to version 3.2 or later recommended for affected products. The CVSS vector indicates a local attack vector with low attack complexity, requiring low privileges and no user interaction, resulting in high availability impact.

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 RUGGEDCOM RST2428P switches, SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices, or SCALANCE XCM-/XRM-/XCH-/XRH-300 family industrial Ethernet switches in operational technology environments should prioritize patching. System administrators responsible for industrial control system infrastructure, network security engineers in manufacturing and critical infrastructure sectors, and compliance teams tracking CVE remediation for OT assets should monitor this advisory.

Technical summary

CVE-2024-49933 addresses out-of-bounds shift operations in the blk_iocost (block I/O cost controller) component of the Linux kernel. This vulnerability affects Siemens industrial networking equipment running SINEC OS, specifically the RUGGEDCOM RST2428P and multiple SCALANCE product families. The vulnerability requires local access with low privileges to exploit, and successful exploitation results in high availability impact. The fix involves correcting shift operations that could operate outside valid bounds. Siemens has released version 3.2 or later to address this issue across affected product lines.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided updates to version 3.2 or later for affected Siemens RUGGEDCOM RST2428P and SCALANCE product families
  • Review Siemens ProductCERT advisory SSA-355557 for specific configuration guidance regarding SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family products
  • Implement defense-in-depth strategies for industrial control systems as recommended by CISA
  • Monitor CISA ICS advisories for additional updates to this vulnerability

Evidence notes

The vulnerability description 'blk_iocost: fix more out of bound shifts' indicates this is a kernel-level issue in the block I/O cost controller. The CISA CSAF advisory ICSA-25-226-07, republished on February 25, 2026, incorporates Siemens ProductCERT SSA-355557 advisory updates. The affected products are industrial Ethernet switches and routers used in operational technology environments.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-49933 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-49933

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-49933 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-49933

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-226-07.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-355557.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-355557.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-07

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.