Improper privilege management in Johnson Controls Facility Explorer SNC Series…
Priority MEDIUM 40CWE-269Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Privilege escalation, Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-269 and CWE-863.
Summary
Successful exploitation of this vulnerability could give an authenticated Facility Explorer SNC Series Supervisory Controller (F4-SNC) user an unintended level of access to the controller’s file system, allowing them to access or modify system files by sending specifically crafted web messages to the F4-SNC.
Why it matters now
EPSS 0.00816 57th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Johnson Controls | Facility Explorer SNC Series Supervisory Controllers (F4-SNC) | Facility Explorer SNC Series Supervisory Controllers version 11 11 | — | No fix listed | CNA |
- Facility Explorer SNC Series Supervisory Controllers (F4-SNC) VendorJohnson Controls Affected Facility Explorer SNC Series Supervisory Controllers version 11 11 Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:johnsoncontrols:f4-snc_firmware:11:*:*:*:*:*:*:* | 11 | Vulnerable | Johnson Controls |
| cpe:2.3:h:johnsoncontrols:f4-snc:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Johnson Controls |
- cpe:2.3:o:johnsoncontrols:f4-snc_firmware:11:*:*:*:*:*:*:* Versions 11 Vulnerable ·Johnson Controls
- cpe:2.3:h:johnsoncontrols:f4-snc:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Johnson Controls
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27661
- 2026-10-03 Alias added: GHSA-3fjw-3ffh-wrxh
References
More Johnson Controls F4-snc Firmware vulnerabilities
- TI-2023-04139 Uncontrolled Resource Consumption in Metasys and Facility Explorer CVSS 3.1HIGH 7.5
Sources
- CVE-2021-27661 · CVE Program
- CVE-2021-27661 · NVD
- FIRST EPSS
- GHSA-3fjw-3ffh-wrxh · 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