High severity8.8NVD Advisory· Published Jul 1, 2021· Updated Jun 17, 2026
CVE-2021-27661
CVE-2021-27661
Description
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- Johnson Controls/Facility Explorer SNC Series Supervisory Controllers (F4-SNC)v5Range: Facility Explorer SNC Series Supervisory Controllers version 11 11
Patches
Vulnerability mechanics
References
2- us-cert.cisa.gov/ics/advisories/icsa-21-182-01nvdThird Party AdvisoryUS Government Resource
- www.johnsoncontrols.com/cyber-solutions/security-advisoriesnvdVendor Advisory
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