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PatchSiren cyber security CVE debrief

CVE-2023-52435 Siemens CVE debrief

A vulnerability in the Linux kernel's networking stack, specifically in the skb_segment() function, could allow an MSS (Maximum Segment Size) overflow condition. The vulnerability has been resolved in the Linux kernel. Siemens has identified this CVE as affecting certain industrial networking products including the RUGGEDCOM RST2428P and SCALANCE families, though the CISA CSAF advisory marks the impact assessment as 'Misinformed' for the affected product IDs. The vulnerability was published on August 12, 2025, with subsequent modifications through February 25, 2026, including corrections to affected product listings and removal of rejected CVEs. Organizations should consult the Siemens ProductCERT advisory SSA-613116 for specific patch and mitigation guidance for affected industrial control systems.

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 equipment, particularly in critical infrastructure environments. System administrators managing RUGGEDCOM and SCALANCE product lines. OT security teams responsible for patch management in industrial control system environments.

Technical summary

The vulnerability exists in the Linux kernel's skb_segment() function, which handles TCP segmentation. An MSS overflow condition could potentially lead to memory corruption or denial of service. The fix prevents this overflow during segment processing. This kernel-level vulnerability affects Siemens industrial networking products that utilize the vulnerable kernel code, including RUGGEDCOM RST2428P and SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family devices. The CISA advisory notes the impact assessment as 'Misinformed,' suggesting potential discrepancies in initial severity or scope assessment that were addressed in subsequent revisions.

Defensive priority

medium

Recommended defensive actions

  • Review Siemens ProductCERT advisory SSA-613116 for affected product versions and available patches
  • Apply kernel updates or vendor-provided firmware patches for affected Siemens industrial networking equipment
  • Monitor network traffic for anomalous segmentation behavior on affected systems
  • Implement network segmentation for industrial control systems per CISA recommended practices
  • Validate MSS settings in network configurations to reduce attack surface

Evidence notes

CVE published 2025-08-12; modified 2026-02-25. Source CISA CSAF ICSA-25-226-15, based on Siemens ProductCERT SSA-613116. Impact marked 'Misinformed' in source threats data for product IDs CSAFPID-0001, CSAFPID-0003, CSAFPID-0004. Revision history shows corrections to affected products on 2026-02-12 and 2026-02-24.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-52435 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-52435

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

  • CVE-2023-52435 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-52435

    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-25-226-15.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-613116.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-613116.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-226-15

    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.