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PatchSiren cyber security CVE debrief

CVE-2025-40948 Siemens CVE debrief

CVE-2025-40948 is a medium-severity issue in Siemens RUGGEDCOM ROX web server JSON-RPC handling. CISA’s advisory says affected devices fail to properly validate input, which could let an authenticated remote attacker read arbitrary files from the underlying operating system filesystem with root privileges. The supplied remediation is to update to V2.17.1 or later.

Vendor
Siemens
Product
RUGGEDCOM ROX MX5000
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-12
Original CVE updated
2026-05-14
Advisory published
2026-05-12
Advisory updated
2026-05-14

Who should care

OT/ICS operators running Siemens RUGGEDCOM ROX MX5000, MX5000RE, RX1400, RX1500, RX1501, RX1510, RX1511, RX1512, RX1524, RX1536, or RX5000—especially if the web interface is exposed or used for remote administration.

Technical summary

The flaw is in the web server’s JSON-RPC interface and is described as improper input validation. The advisory indicates an attacker must already be authenticated (CVSS PR:H), but the attack is network-reachable (AV:N) and can still cause high confidentiality impact by enabling arbitrary file reads from the underlying OS with root privileges. The supplied CVSS vector is CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N, and the source references CWE-88.

Defensive priority

Prioritize this as a patch-now issue for any deployed or remotely managed affected device. Even with the authentication requirement, the attack surface is network reachable and the impact is high-value file disclosure at root privilege.

Recommended defensive actions

  • Update affected Siemens RUGGEDCOM ROX devices to V2.17.1 or later using the vendor guidance.
  • Reduce exposure of the device web interface and JSON-RPC management paths to only trusted administrative networks.
  • Verify which assets match the affected product list and version range before and after remediation.
  • Review authentication, access control, and remote-management paths around the web server.
  • Use CISA ICS recommended practices and defense-in-depth guidance to add compensating controls where patching cannot be immediate.

Evidence notes

This debrief is based on CISA CSAF advisory ICSA-26-134-02, which republishes Siemens ProductCERT advisory SSA-973901. The source corpus identifies the issue as improper input validation in the JSON-RPC interface leading to arbitrary file read with root privileges, with publication on 2026-05-12 and republication on 2026-05-14. No KEV listing or ransomware linkage is present in the supplied data.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-40948 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-40948

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

  • CVE-2025-40948 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-40948

    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/2026/icsa-26-134-02.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-973901.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-973901.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-134-02

    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.