Johnson Controls iSTAR Configuration Utility up to 6.9.7 stack-based overflow

Summaryinfo

A vulnerability classified as critical has been found in Johnson Controls iSTAR Configuration Utility up to 6.9.7. The affected element is an unknown function. This manipulation causes stack-based overflow. This vulnerability is registered as CVE-2025-26386. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Johnson Controls iSTAR Configuration Utility up to 6.9.7. It has been declared as critical. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect availability. The summary by CVE is:

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.

The weakness was published by Bughunter Tenable. It is possible to read the advisory at johnsoncontrols.com. This vulnerability is known as CVE-2025-26386 since 02/07/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/28/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Johnson Controls

Name

• iSTAR Configuration Utility

Version

• 6.9.0
• 6.9.1
• 6.9.2
• 6.9.3
• 6.9.4
• 6.9.5
• 6.9.6
• 6.9.7

CPE 2.3info

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CPE 2.2info

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