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PatchSiren cyber security CVE debrief

CVE-2024-27939 Siemens CVE debrief

A critical unauthenticated arbitrary file upload vulnerability in Siemens RUGGEDCOM CROSSBOW enables remote code execution with system privileges. The vulnerability was disclosed on May 14, 2024, with a CVSS 3.1 score of 9.8. Attackers can exploit this weakness without authentication to upload malicious files and achieve full system compromise. Siemens has released version 5.5 to address this vulnerability. Organizations should prioritize patching given the unauthenticated nature of the attack vector and the high impact potential.

Vendor
Siemens
Product
RUGGEDCOM CROSSBOW
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2024-05-14
Original CVE updated
2024-05-14
Advisory published
2024-05-14
Advisory updated
2024-05-14

Who should care

Organizations operating Siemens RUGGEDCOM CROSSBOW systems in industrial control system (ICS) environments, critical infrastructure operators, OT security teams, and network administrators responsible for ruggedized communication equipment in utility, transportation, and industrial sectors.

Technical summary

CVE-2024-27939 is a critical vulnerability in Siemens RUGGEDCOM CROSSBOW that permits unauthenticated users to upload arbitrary files. This weakness can be chained to achieve arbitrary code execution with system-level privileges. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction. The attack complexity is low, making this vulnerability particularly dangerous for exposed systems. Siemens has addressed this issue in version 5.5, which should be deployed immediately to prevent exploitation.

Defensive priority

critical

Recommended defensive actions

  • Apply Siemens RUGGEDCOM CROSSBOW update to version 5.5 or later immediately
  • Restrict network access to RUGGEDCOM CROSSBOW management interfaces to authorized administrative hosts only
  • Monitor for unauthorized file upload attempts and unexpected file system changes on affected systems
  • Implement network segmentation to isolate RUGGEDCOM CROSSBOW systems from untrusted networks
  • Review system logs for indicators of compromise, particularly around the disclosure date of May 14, 2024

Evidence notes

Vulnerability details sourced from CISA ICS advisory ICSA-24-137-10 and Siemens security advisory SSA-916916. The advisory confirms unauthenticated arbitrary file upload leading to system-level code execution. CVSS vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates network exploitable, low attack complexity, no privileges required, no user interaction, with high impact across confidentiality, integrity, and availability.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-27939 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-27939

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

  • CVE-2024-27939 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-27939

    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/2024/icsa-24-137-10.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-916916.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-916916.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/pdf/ssa-916916.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/txt/ssa-916916.txt

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-137-10

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/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

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.