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.
CVE-2026-21659
CRITICALNVD 9.89.8—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2026-02-27. NVD baseline CVSS 9.8; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.8
- EG Score
- 9.8(medium)
- EG Risk
- 49(Track)EG Risk 49/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity98% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 56%
- KEV
- Not listed
Published
February 27, 2026
Last Modified
June 17, 2026
Advisory Details (2)
Auto-updated Jul 27, 2026⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
generic Patch Available
Security Advisories | Johnson Controls
https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisoriescisa Patch Available🔴 Active Exploitation
Johnson Controls, Inc. Frick Controls Quantum HD | CISA
Johnson Controls, Inc. Frick Controls Quantum HD | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.
https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-01Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-27 14:13 UTCEPSS rescore
- 2026-07-27 14:03 UTCEG score recompute
- 2026-07-27 14:03 UTCGHSA enrichment
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-21659?
CVE-2026-21659 is a critical vulnerability published on February 27, 2026. 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…
When was CVE-2026-21659 disclosed?
CVE-2026-21659 was first published in the National Vulnerability Database on February 27, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21659 actively exploited?
CVE-2026-21659 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.7% of all scored CVEs.
What is the CVSS score of CVE-2026-21659?
CVE-2026-21659 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-21659?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21659, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-21659
Is Your Infrastructure Affected by CVE-2026-21659?
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