CVE-2026-21656Network attack vector

Pre-authentication code execution via insufficient parameter validation

Published Feb 27, 2026 · Updated Feb 27, 2026

Code injection in Johnson Controls FRICK Quantum HD 10.22 and earlier allows remote attackers to alter device behavior before authentication. The controller insufficiently validates unspecified parameters before using them to generate code, permitting unexpected actions. No specific parameter, handler, or command-execution path is publicly disclosed; the published impacts are bounded to device integrity and availability.

CVSS severity8.8
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Johnson Controls FRICK Quantum HD 10.22 and earlier allows remote attackers to alter device behavior before authentication. The controller insufficiently validates unspecified parameters before using them to generate code, permitting unexpected actions. No specific parameter, handler, or command-execution path is publicly disclosed; the published impacts are bounded to device integrity and availability.

The record

CVE
CVE-2026-21656
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Johnson Controls
Product
FRICK Quantum HD
Classifications
CWE-94, CAPEC-242, T1190
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

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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
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-94Improper Control of Generation of Code ('Code Injection')
CAPEC-242Code Injection
T1190Exploit Public-Facing Application

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

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Your stack

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