CVE-2019-7593: Metasys use of shared RSA key pairs

Severity: critical (CVSS 9.1 v3.0)
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: 2019-08-20 · updated 2026-06-17
Weakness: CWE-323

Description

Metasys® ADS/ADX servers and NAE/NIE/NCE engines prior to 9.0 make use of a shared RSA key pair for certain encryption operations involving the Site Management Portal (SMP).

Affected products

Johnson Controls Metasys System: before 9.0 — fixed in 9.0

How to fix

Upgrade to a fixed version: Johnson Controls Metasys System 9.0. Check the vendor advisory for mitigations.

References

https://www.johnsoncontrols.com/-/media/jci/cyber-solutions/product-security-advisories/2019/jci-psa-2019-06-v1-metasys-icsa-19-227-01.pdf
https://www.us-cert.gov/ics/advisories/icsa-19-227-01
https://www.johnsoncontrols.com/-/media/jci/cyber-solutions/product-security-advisories/2019/jci-psa-2019-06-v1-metasys-icsa-19-227-01.pdf
https://www.us-cert.gov/ics/advisories/icsa-19-227-01

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