What’s Vulnerable › Vulnerabilities

CVE-2023-4486: Uncontrolled Resource Consumption in Metasys and Facility Explorer

• Severity: high (CVSS 7.5 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: 2023-12-07 · updated 2026-06-17
• Weakness: CWE-400

Description

Under certain circumstances, invalid authentication credentials could be sent to the login endpoint of Johnson Controls Metasys NAE55, SNE, and SNC engines prior to versions 11.0.6 and 12.0.4 and Facility Explorer F4-SNC engines prior to versions 11.0.6 and 12.0.4 to cause denial-of-service.

Affected products

• Johnson Controls Facility Explorer SNC Series Supervisory Controllers (F4-SNC): before 11.0.6; from 12.0.0 before 12.0.4 — fixed in 11.0.6, 12.0.4
• Johnsoncontrols Nae55 Firmware: before 12.0.4 — fixed in 12.0.4
• Johnsoncontrols Snc16120-04 Firmware: before 12.0.4 — fixed in 12.0.4
• Johnsoncontrols Snc16120-0 Firmware: before 12.0.4 — fixed in 12.0.4
• Johnsoncontrols Snc25150-04 Firmware: before 12.0.4 — fixed in 12.0.4
• Johnsoncontrols Snc25150-0 Firmware: before 12.0.4 — fixed in 12.0.4
• Johnsoncontrols Sne10500 Firmware: before 12.0.4 — fixed in 12.0.4
• Johnsoncontrols Sne11000 Firmware: before 12.0.4 — fixed in 12.0.4
• Johnsoncontrols Sne110L0 Firmware: before 12.0.4 — fixed in 12.0.4
• Johnsoncontrols Sne22000 Firmware: before 12.0.4 — fixed in 12.0.4

How to fix

Upgrade to a fixed version: Johnson Controls Facility Explorer SNC Series Supervisory Controllers (F4-SNC) 11.0.6, 12.0.4; Johnsoncontrols Nae55 Firmware 12.0.4; Johnsoncontrols Snc16120-04 Firmware 12.0.4; Johnsoncontrols Snc16120-0 Firmware 12.0.4; Johnsoncontrols Snc25150-04 Firmware 12.0.4; Johnsoncontrols Snc25150-0 Firmware 12.0.4; Johnsoncontrols Sne10500 Firmware 12.0.4; Johnsoncontrols Sne11000 Firmware 12.0.4; Johnsoncontrols Sne110L0 Firmware 12.0.4; Johnsoncontrols Sne22000 Firmware 12.0.4. Check the vendor advisory for mitigations.

References

• https://www.cisa.gov/news-events/ics-advisories/icsa-23-341-03
• https://www.johnsoncontrols.com/cyber-solutions/security-advisories
• https://www.cisa.gov/news-events/ics-advisories/icsa-23-341-03
• https://www.johnsoncontrols.com/cyber-solutions/security-advisories

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