AC2000 Uncontrolled Search Path Element
Priority LOW 37CWE-427Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-427.
Summary
An Uncontrolled Search Path Element vulnerability in JohnsonControls AC2000 on Windows allows Leveraging/Manipulating Configuration File Search Paths. This issue affects AC2000: from 10.6 before release 10, from 11.0 before release 9, from 12 before release 3.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00108 1st percentileScored 2026-11-07
Fix Fixed AC2000 (Johnson Controls): release 10, release 9, release 3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Johnson Controls | AC2000 | 10.6 to before release 10; 11.0 to before release 9; 12 to before release 3 | release 10, release 9, release 3 | Patch available | CNA |
- AC2000 VendorJohnson Controls Affected 10.6 to before release 10; 11.0 to before release 9; 12 to before release 3 Fixed in release 10, release 9, release 3 Patch available CNA
Remediation
- Fix · CNA AC2000 (Johnson Controls) Fixed in release 10, release 9, release 3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-21661
- 2026-10-03 Alias added: GHSA-qcgm-qmr8-52ww
More Johnson Controls vulnerabilities
- TI-2025-19346 Metasys product command injection vulnerability could allow remote SQL execution CVSS 4.0CRITICAL 9.5
- TI-2023-01901 Improper Authentication for OpenBlue Enterprise Manager Data Collector CVSS 3.1CRITICAL 10.0
- TI-2023-04421 An unauthorized user could access debug features in Quantum HD Unity products that were… CVSS 3.1CRITICAL 10.0
- TI-2026-17437 Johnson Controls -Frick Quantum HD- Unauthenticated Remote Code Execution CVSS 4.0HIGH 8.8
- TI-2025-19344 Johnson Controls Software House iSTAR Configuration Utility (ICU) Tool CVSS 4.0CRITICAL 9.3
- TI-2023-03311 Missing brute-force protection in Johnson Controls IQ Wifi 6 CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-21661 · CVE Program
- CVE-2026-21661 · NVD
- FIRST EPSS
- GHSA-qcgm-qmr8-52ww · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences