What is CVE-2019-7593?

CVE-2019-7593 is a medium-severity vulnerability in Johnson Controls Metasys Versions Prior To 9.0, classified under Reusing a Nonce, Key Pair in Encryption. CVSS score: 6.8/10. Published 2019-08-20.

How severe is CVE-2019-7593?

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

Vulnerability in Johnson Controls Metasys Versions Prior To 9.0

CVE-2019-7593

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).

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: 0.008 (56.4th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · 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-2019-7593?: CVE-2019-7593 is a medium-severity vulnerability in Johnson Controls Metasys Versions Prior To 9.0, classified under Reusing a Nonce, Key Pair in Encryption. CVSS score: 6.8/10. Published 2019-08-20.
How severe is CVE-2019-7593?: Medium severity. CVSS v3 base score is 6.8 out of 10.