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CVE-2021-27661

Facility Explorer

HIGH
8.8
CVSS Score
Published: July 1, 2021 at 01:41 PM UTC
Updated: June 17, 2026 at 03:45 AM UTC
2 products affected across 1 vendorF4-snc FirmwareFacility Explorer SNC Series Supervisory Controllers (F4-SNC)

Using Facility Explorer SNC Series Supervisory Controllers (F4-SNC) by Johnson Controls?

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Severity
HIGH8.8
Exploit prediction
EPSS 0.8%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Third Party Advisoryx_refsource_CERTUS Government Resource
Source: [email protected]
https://us-cert.cisa.gov/ics/advisories/icsa-21-182-01
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.johnsoncontrols.com/cyber-solutions/security-advisories

CVSS

8.8HIGHjci
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-269CWE-863

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