What is CVE-2019-7594?

CVE-2019-7594 is a medium-severity vulnerability in Johnson Controls Metasys Versions Prior To 9.0, classified under Use of Hard-coded Cryptographic Key. CVSS score: 6.8/10. Published 2019-08-20.

How severe is CVE-2019-7594?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Johnson Controls Metasys Versions Prior To 9.0

CVE-2019-7594

Metasys® ADS/ADX servers and NAE/NIE/NCE engines prior to 9.0 make use of a hardcoded RC2 key for certain encryption operations involving the Site Management Portal (SMP).

Published 2019-08-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Johnson Controls Metasys Versions Prior To 9.0 — versions 9.0
Johnsoncontrols Metasys System

Weakness classification (CWE)

References

www.johnsoncontrols.com/-/media/jci/cyber-solutions/product-security-advisories… (Vendor Advisory)
www.us-cert.gov/ics/advisories/icsa-19-227-01 (US Government Resource, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2019-7594?: CVE-2019-7594 is a medium-severity vulnerability in Johnson Controls Metasys Versions Prior To 9.0, classified under Use of Hard-coded Cryptographic Key. CVSS score: 6.8/10. Published 2019-08-20.
How severe is CVE-2019-7594?: Medium severity. CVSS v3 base score is 6.8 out of 10.