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PatchSiren cyber security CVE debrief

CVE-2024-27942 Siemens CVE debrief

CVE-2024-27942 is a HIGH severity vulnerability (CVSS 7.5) in Siemens RUGGEDCOM CROSSBOW, published 2024-05-14. The vulnerability allows any unauthenticated client to disconnect any active user from the server, enabling denial of service attacks that prevent legitimate users from performing actions in the system. The attack vector is network-based with low attack complexity, requiring no privileges or user interaction. Siemens has released a vendor fix: update to version 5.5 or later. CISA published advisory ICSA-24-137-10 on the same date as the CVE publication.

Vendor
Siemens
Product
RUGGEDCOM CROSSBOW
CVSS
HIGH 7.5
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 or operational technology environments should prioritize this vulnerability. System administrators, OT security teams, and network engineers responsible for critical infrastructure should apply the vendor patch and implement compensating controls. Organizations subject to NERC CIP or other industrial cybersecurity regulations should assess this vulnerability for compliance implications.

Technical summary

The vulnerability exists in the session management of affected RUGGEDCOM CROSSBOW systems. An unauthenticated attacker can send a request to the server that causes any active user session to be terminated. This is a network-accessible vulnerability with low attack complexity, requiring no authentication or user interaction. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) indicates high availability impact with no confidentiality or integrity impact. The vulnerability is classified as a denial of service condition that prevents users from performing actions in the system.

Defensive priority

HIGH

Recommended defensive actions

  • Update Siemens RUGGEDCOM CROSSBOW to version 5.5 or later per vendor guidance
  • Review CISA ICS recommended practices for industrial control system security
  • Implement network segmentation to limit exposure of RUGGEDCOM CROSSBOW systems
  • Monitor for anomalous session termination events that may indicate exploitation attempts
  • Apply defense-in-depth strategies for industrial control environments

Evidence notes

CVE published 2024-05-14; CISA advisory ICSA-24-137-10 published same date; Siemens SSA-916916 advisory issued; CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H confirms network-accessible, unauthenticated denial of service; vendor fix available in version 5.5 or later.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-27942 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-27942

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

  • CVE-2024-27942 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-27942

    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.