CVE-2025-61736

iSTAR- Improper Validation of Certificate Expiration

Published Dec 17, 2025 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Description
Successful exploitation of this vulnerability could result in the product failing to re-establish communication once the certificate expires.

Remediation

Vendor Solution

Johnson Controls recommends the following mitigations: Host-based certificates using TLS 1.2: * Quickest solution * No Upgrade required to specific C•CURE or iSTAR software/firmware versions * Requires downloading a new certificate to all iSTAR panels simultaneously, resulting in a brief system downtime Convert encryption mode to TLS 1.3, per cluster: * Requires firmware 6.9.0 or higher, and C•CURE 9000 v2.90 SP3 or higher * Enables phased implementation by cluster, minimizing disruption * Note: TLS 1.3 is not supported on iSTAR eX, iSTAR Edge, and iSTAR Ultra LT panels Upgrade legacy panels to new G2 hardware: * Recommended for smaller systems due to time constraints * Applies primarily to iSTAR eX, iSTAR Edge, and iSTAR LT panels

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Johnsoncontrols
Johnsoncontrols istar Edge
Johnsoncontrols istar Ultra
Johnsoncontrols istar Ultra Lt
Johnsoncontrols istar Ultra Se
Johnsoncontrols istarex
Vendors & Products Johnsoncontrols
Johnsoncontrols istar Edge
Johnsoncontrols istar Ultra
Johnsoncontrols istar Ultra Lt
Johnsoncontrols istar Ultra Se
Johnsoncontrols istarex
Type Values Removed Values Added
Description Successful exploitation of this vulnerability could result in the product failing to re-establish communication once the certificate expires.
Title iSTAR- Improper Validation of Certificate Expiration
Weaknesses CWE-298
References
Metrics cvssV4_0

{'score': 7.1, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
jci
Published
Updated
Dec 17, 2025, 3:09 PM
Reserved
Sep 30, 2025, 3:51 PM
Status
Deferred
Published
Dec 17, 2025, 1:15 PM
Modified
Jun 17, 2026, 9:50 AM