CVE-2026-21654Network attack vector

Pre-authentication command execution via insufficient parameter validation

Published Feb 27, 2026 · Updated Feb 27, 2026

OS command injection in Johnson Controls FRICK Quantum HD 10.22 and earlier allows remote attackers to execute commands before authentication. Johnson Controls has not disclosed the affected parameters or the code path that passes their insufficiently validated values to an operating-system command. Network access to the controller is sufficient; exploitation can modify controller behavior or interrupt service without exposing stored data.

CVSS severity8.8
High
EPSS probability1.51%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

OS command injection in Johnson Controls FRICK Quantum HD 10.22 and earlier allows remote attackers to execute commands before authentication. Johnson Controls has not disclosed the affected parameters or the code path that passes their insufficiently validated values to an operating-system command. Network access to the controller is sufficient; exploitation can modify controller behavior or interrupt service without exposing stored data.

The record

CVE
CVE-2026-21654
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Johnson Controls
Product
FRICK Quantum HD
Classifications
CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Frick Controls Quantum HD version 10.22 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Johnson Controls · FRICK Quantum HDversion=Frick Controls Quantum HD version 10.22 and prior

Published CVSS scores

8.8Johnson ControlsCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
9.1CISACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo