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

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

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Send crafted network request
Exploit

Inject OS commands in unvalidated parameter
Execution

Execute arbitrary commands as device process
Impact

Compromise system integrity and confidentiality

Vulnerability Assessment

Weakness	CWE CWE-78 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization OS command sanitization, avoid shell exec MITRE ATT&CK 2 techniques across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Frick Controls Quantum HD version 10.22 or earlier with network accessibility enabled. Remote unauthenticated exploitation via vulnerable input parameters before authentication gates. No special configuration required — vulnerability exists in default pre-authentication code paths.
Impact	CVSS 9.8. ICS vulnerability affecting industrial refrigeration — compromise could impact food safety, pharmaceutical storage, or data center cooling.
Exploit ScenarioDerived	Attacker accesses Frick Quantum HD controller on OT network, injects commands to modify refrigeration setpoints, potentially spoiling temperature-sensitive goods or damaging equipment.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

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.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Command injection in Johnson Controls Frick Quantum HD refrigeration controller.

RemediationAI

Apply Johnson Controls security patch. Isolate ICS controllers from IT networks. Monitor for unauthorized command execution.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

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

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Exploit and PoC references, threat intelligence from 22 sources

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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

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.

Executive ViewAI

Why It Matters

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. Organizations running this equipment face immediate risk of complete system compromise, data theft, and operational disruption, with no vendor patch currently available.

Business Impact: Severe

Compensating Controls

Implement network segmentation and restrict access via firewall rules to trusted networks only; disable remote access and management interfaces if operationally acceptable; deploy network-based IDS/IPS rules to detect OS command injection patterns; monitor system logs for suspicious command execution; consider WAF deployment if web-accessible; disable unnecessary features/services on affected devices; implement strict input validation and rate limiting at network perimeter; require multi-factor authentication for any management access.

Threat Intelligence Overview

EPSS Score

0.2%

Top 65% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.