PT-2026-5091 · Johnson Controls · Istar Configuration Utility

Bughunter Tenable · Published 2026-01-28 · Updated 2026-01-28 · CVE-2025-26386

Positive Technologies (AI Summary)

CVSS v4.0

7.1

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Johnson Controls iSTAR Configuration Utility (ICU) versions prior to 6.9.7

Description The Johnson Controls iSTAR Configuration Utility (ICU) contains a stack-based buffer overflow issue. Exploitation of this issue may lead to operating system failure on systems hosting the ICU tool.

Recommendations Update to a version of Johnson Controls iSTAR Configuration Utility (ICU) later than 6.9.7.

Fix

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2025-26386

Affected Products

Istar Configuration Utility

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2025-26386 · Security Note
• https://twitter.com/CVEnew/status/2016478168178209157 · Twitter Post
• https://johnsoncontrols.com/trust-center/cybersecurity/security-advisories · Note
• https://cisa.gov/news-events/ics-advisories/icsa-26-022-04 · Note
• https://t.me/cveNotify/150112 · Telegram Post