What is the CVSS score of CVE-2026-21654?

CVE-2026-21654 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

How to fix or mitigate CVE-2026-21654?

Within 24 hours: Identify and inventory all Frick Controls Quantum HD systems in your environment and assess their network exposure. Within 7 days: Implement network segmentation to restrict access to affected systems to authorized personnel only, disable remote management features if operationally feasible, and establish 24/7 monitoring for suspicious command execution. Within 30 days: Contact Johnson Controls for patch timelines and workaround guidance, evaluate alternative control systems if patches are significantly delayed, and conduct forensic analysis if any unauthorized access is suspected.

Frick Controls Quantum Hd Firmware CVE-2026-21654

Q: Which versions of Frick Controls Quantum Hd Firmware are affected by CVE-2026-21654?

A critical OS command injection vulnerability (CVSS 9.8) in Johnson Controls Frick Controls Quantum HD allows unauthenticated attackers to execute arbitrary commands with full system privileges.

CRITICAL

OS Command Injection (CWE-78)

2026-02-27 productsecurity@jci.com

Command Injection Frick Controls Quantum Hd Firmware Johnsoncontrols

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 27, 2026 - 09:16 nvd

CRITICAL 9.8

DescriptionCVE.org

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Johnson Controls Frick Controls Quantum HD allows OS Command Injection. Insufficient validation of input in certain parameters may permit unexpected actions, which could impact the security of the device before authentication occurs.This issue affects Frick Controls Quantum HD version 10.22 and prior.

AnalysisAI

OS command injection in Johnson Controls Frick Controls Quantum HD allows unauthenticated remote attackers to execute arbitrary commands on industrial refrigeration control systems. CVSS 9.8.

Technical ContextAI

CWE-78 OS command injection in industrial refrigeration controller. First of several critical CVEs affecting the Frick Controls Quantum HD product line.