CVE-2026-21659

Name: CVE-2026-21659
Creator: NVD / NIST
Published: 2026-02-27T10:16:22.373+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2026-21659 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. Unauthenticated Remote Code Execution and Information Disclosure due to Local File Inclusion (LFI) vulnerability in Johnson Controls Frick Controls Quantum HD allow an unauthenticated attacker to execute arbitrary code on the affected device, leading to full system compromise. This issue affects Frick Controls Quantum HD: Frick Controls Quantum HD version 10.22 and prior.. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

Description

Unauthenticated Remote Code Execution and Information Disclosure due to Local File Inclusion (LFI) vulnerability in Johnson Controls Frick Controls Quantum HD allow an unauthenticated attacker to execute arbitrary code on the affected device, leading to full system compromise. This issue affects Frick Controls Quantum HD: Frick Controls Quantum HD version 10.22 and prior.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

8.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.91%

55.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Johnsoncontrols	Frick Controls Quantum Hd Firmware	<= 10.22

References

https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-01Third Party Advisory, US Government Resource
https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisoriesVendor Advisory

Timeline

Published: Feb 27, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21659?

How severe is CVE-2026-21659?

CVE-2026-21659 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21659?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21659?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST