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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.

Official resources

2024-05-30