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Fencer Vulns
medium 6.8

CVE-2019-7594 json

Metasys use of hardcoded RC2 key

published 2019-08-20 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-17132

cvss
6.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

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).

Patch / fix

  • johnsoncontrols metasys_system 9.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-19-227-01 updated cvss 6.8

Johnson Controls Metasys

  • Johnson Controls Inc Metasys system < 9.0
    affected: mitigation “Users should upgrade to Version 9.0 or later and configure sites with trusted certificates.” johnsoncontrols.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 6.8 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N

Affected products

  • Johnson Controls Metasys versions prior to 9.0

Classification

Weakness
  • CWE-321 Use of Hard-coded Cryptographic Key
  • CWE-798 Use of Hard-coded Credentials

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.