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PatchSiren cyber security CVE debrief

CVE-2024-2421 LenelS2 CVE debrief

CVE-2024-2421 is a critical unauthenticated remote code execution vulnerability in LenelS2 NetBox, an access control and event monitoring system used in physical security environments. The vulnerability affects versions prior to and including 5.6.1 and was disclosed by CISA on May 30, 2024. An attacker can exploit this flaw to execute malicious commands with elevated permissions without requiring authentication, presenting severe risk to affected installations. The CVSS 3.1 score of 9.1 reflects network attackability, low complexity, and high impact across confidentiality, integrity, and availability. Carrier has released NetBox version 5.6.2 to address this vulnerability. Organizations should prioritize upgrading through their authorized installer and follow the NetBox hardening guide available in the product's built-in help menu.

Vendor
LenelS2
Product
NetBox
CVSS
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2024-05-30
Original CVE updated
2024-05-30
Advisory published
2024-05-30
Advisory updated
2024-05-30

Who should care

Organizations using LenelS2 NetBox for physical access control and security event monitoring, particularly in critical infrastructure, commercial facilities, and enterprise environments. Security teams responsible for OT/ICS security and physical security infrastructure.

Technical summary

Unauthenticated remote code execution vulnerability in LenelS2 NetBox access control and event monitoring system. Affects versions ≤5.6.1. Allows attackers to execute commands with elevated permissions. Fixed in version 5.6.2.

Defensive priority

critical

Recommended defensive actions

  • Upgrade LenelS2 NetBox to version 5.6.2 by contacting your authorized installer
  • Follow the NetBox hardening guide available in the product's built-in help menu
  • Review Carrier's security bulletin for additional mitigation guidance
  • Apply network segmentation to limit exposure of NetBox systems
  • Monitor for unauthorized access attempts to NetBox management interfaces

Evidence notes

CISA ICS advisory ICSA-24-151-01 published May 30, 2024 confirms unauthenticated RCE in NetBox versions ≤5.6.1 with vendor fix in 5.6.2. CVSS 3.1 vector AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H per source.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-2421 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-2421

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

  • CVE-2024-2421 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-2421

    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-24-151-01.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-151-01

    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

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf

    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/uscert/sites/default/files/publications/emailscams0905.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ncas/tips/ST04-014

    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.