CVE-2025-61736
iSTAR- Improper Validation of Certificate Expiration
02 Description
iSTAR- Improper Validation of Certificate Expiration
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.10% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 1.1% of scored records. A rank, not a probability.
- NVD base score
- 7.1 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS 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/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
- NVD analysis status
- Deferred. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2025-12-17 12:36Z10 MO AGO
- Last updated
- 2025-12-17 15:09Z10 MO AGO
- Reserved
- 2025-09-30
- Assigning CNA
- jci
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.1)
- CNA CVSS 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
- CWE-298Improper Validation of Certificate ExpirationVariant
- Data version
- 5.2
- Document digest
- 427bb7c101514301861515423fd87b7a4fa14f5a44f457efdc12804598a459d6
05 Affected products
06 References
- www.johnsoncontrols.comhttps://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories
- www.cisa.govhttps://www.cisa.gov/news-events/ics-advisories/icsa-25-338-04
07 Remediation
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