High severity · published Jan 28, 2026
CVE-2025-26386
Stack-based Buffer Overflow in Johnson Controls iSTAR Configuration Utility (ICU) tool
7.1
CVSS
0.5%
EPSS
No
On KEV
Description
Johnson Controls iSTAR Configuration Utility (ICU) has Stack-based Buffer Overflow vulnerability. This issue affects iSTAR Configuration Utility (ICU) version 6.9.7 and prior. Successful exploitation of this vulnerability could result in failure within the operating system of the machine hosting the ICU tool.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IC
iSTAR Configuration Utility (ICU) · Johnson Controls
iSTAR Configuration Utility (ICU) tool version 6.9.7 and prior · source: vendor
Affected product
IC
iSTAR Configuration Utility (ICU)
Johnson Controls
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-26386
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-26386
www.cisa.gov
https://www.cisa.gov/news-events/ics-advisories/icsa-26-022-04
www.johnsoncontrols.com
https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories
More from iSTAR Configuration Utility (ICU)
6.3
CVE-2025-26383
The iSTAR Configuration Utility (ICU) tool leaks memory, which could result in the unintended exposure of unauthorized data from the Windows PC that ICU is running on