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Fencer Vulns
high 7.1

CVE-2025-61736 json

iSTAR- Improper Validation of Certificate Expiration

published 2025-12-17 10 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-203896

cvss
7.1
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

Successful exploitation of this vulnerability could result in the product failing to re-establish communication once the certificate expires.

Vendor advisories

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

cisa ICSA-25-338-04 updated cvss 6.5

Johnson Controls iSTAR

  • Johnson Controls Inc. iSTAR Edge <TLS_1.2 Johnson Controls Inc. iSTAR eX <TLS_1.2
    affected: vendor fix, mitigation “Johnson Controls recommends the following mitigations:” johnsoncontrols.com
  • Johnson Controls Inc. iSTAR Ultra (if in TLS 1.2) <TLS_1.2 Johnson Controls Inc. iSTAR Ultra LT (if in TLS 1.2) <TLS_1.2 Johnson Controls Inc. iSTAR Ultra SE (if in TLS 1.2) <TLS_1.2
    affected: mitigation “Johnson Controls recommends the following mitigations:” 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 7.1 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 7.1 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • Johnson Controls iSTAReX, iSTAR Edge, iSTAR Ultra LT, iSTAR Ultra , iSTAR Ultra SE

Classification

Weakness
  • CWE-298 Improper Validation of Certificate Expiration

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.