CVE-2026-21656 is a critical code injection vulnerability (CWE-94) affecting Johnson Controls Frick Controls Quantum HD firmware versions 10.22 and prior. Insufficient input validation allows unauthenticated attackers to inject code, potentially leading to unexpected actions and compromising device security. This vulnerability carries a CVSS v3.1 score of 9.8 (Critical), indicating it is network-exploitable with low attack complexity and high impact on confidentiality, integrity, and availability. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion and media coverage, suggesting a high level of interest.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 10.22CPE matchmatch criteria | cpe:2.3:o:johnsoncontrols:frick_controls_quantum_hd_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
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/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
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.