What’s Vulnerable › Vulnerabilities

CVE-2021-27661: Facility Explorer

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-01 · updated 2026-06-17
• Weakness: CWE-269

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 products

• Johnson Controls Facility Explorer SNC Series Supervisory Controllers (F4-SNC): 11

References

• https://us-cert.cisa.gov/ics/advisories/icsa-21-182-01
• https://www.johnsoncontrols.com/cyber-solutions/security-advisories
• https://us-cert.cisa.gov/ics/advisories/icsa-21-182-01
• https://www.johnsoncontrols.com/cyber-solutions/security-advisories

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