RCE in Johnson Controls Frick Quantum Hd
CVE-2026-21656
Improper Control of Generation of Code ('Code Injection') vulnerability in Johnson Controls Frick Controls Quantum HD allows Code 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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Johnson Controls Frick Quantum Hd — versions Frick Controls Quantum HD version 10.22 and prior
- Johnsoncontrols Frick Controls Quantum Hd
- Johnsoncontrols Frick Controls Quantum Hd Firmware
Weakness classification (CWE)
References
- www.cisa.gov/news-events/ics-advisories/icsa-26-057-01 (US Government Resource, Third Party Advisory)
- www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21656?
- CVE-2026-21656 is a critical-severity vulnerability in Johnson Controls Frick Quantum Hd, classified under Code Injection. CVSS score: 9.8/10. Published 2026-02-27.
- How severe is CVE-2026-21656?
- Critical severity. CVSS v3 base score is 9.8 out of 10.