CVE-2025-61736 iSTAR- Improper Validation of Certificate Expiration
Attackers can cause communication failure in Johnson Controls iSTAR devices when certificates expire, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-61736?
CVE-2025-61736 is a high-severity vulnerability in Johnson Controls iSTAReX, iSTAR Edge, iSTAR Ultra LT, iSTAR Ultra , iSTAR Ultra SE, published on 17 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Successful exploitation of this vulnerability could result in the product failing to re-establish communication once the certificate expires.
Weakness: CWE-298
Which versions are affected by CVE-2025-61736?
How do I fix CVE-2025-61736?
No fix has been published for CVE-2025-61736 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-61736 being exploited?
There is no known exploitation of CVE-2025-61736 in the wild and no public exploit code.
Sources
Also known as GHSA-56m3-38wm-p83g.