CVE-2026-21659: Johnsoncontrols Frick Controls Quantum Hd Firmware

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• Johnsoncontrols Frick Controls Quantum Hd Firmware: up to and including 10.22

Published 2026-02-27. Last modified 2026-06-17.