CVE-2026-21656: high-severity vulnerability in Johnson Controls Frick Controls Quantum HD
Johnson Controls -Frick Quantum HD- Unauthenticated Remote Code Execution
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.4%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
Johnson Controls · Frick Controls Quantum HDRelated CVEs — Johnson Controls Frick Controls Quantum HD
In the same product, most dangerous first.
CVE-2026-21654HIGHJohnson Controls -Frick Quantum HD- Unauthenticated Remote Code ExecutionEPSS 1.7%CVE-2026-21659HIGHJohnson Controls -Frick Quantum HD-Unauthenticated Remote Code Execution and Information Disclosure due to Local File InclusionEPSS 1.0%CVE-2026-21658HIGHJohnson Controls -Frick Quantum HD- Unauthenticated Remote Code ExecutionEPSS 0.7%CVE-2026-21657HIGHJohnson Controls -Frick Quantum HD- Unauthenticated Remote Code ExecutionEPSS 0.4%CVE-2026-21660MEDIUMJohnson Controls-Frick Quantum HD-Hardcoded Email Credentials Saved as Plaintext in FirmwareEPSS 0.3%