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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.

CVE-2025-26386 is a stack-based buffer overflow vulnerability identified in Johnson Controls iSTAR Configuration Utility (ICU) versions 6.9.7 and prior. The vulnerability stems from improper handling of input data that allows an attacker to overflow a buffer on the stack, leading to memory corruption. This can result in arbitrary code execution, privilege escalation, or denial of service conditions. The vulnerability is remotely exploitable over the network without requiring authentication or privileges, but it does require user interaction, such as opening a maliciously crafted configuration file or input. The CVSS v4.0 score of 7.1 reflects the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no need for privileges. The ICU tool is used primarily for configuring and managing Johnson Controls iSTAR access control systems, which are widely deployed in physical security environments including enterprise buildings, industrial facilities, and critical infrastructure. Although no public exploits are known at this time and no patches have been released, the vulnerability poses a significant risk due to the potential for attackers to gain control over security management systems. The lack of authentication requirements and network accessibility increase the attack surface. The CWE-121 classification highlights the classic buffer overflow nature of the flaw, which is a well-understood and often exploited vulnerability type. Organizations using the ICU tool should be aware of this threat and prepare mitigation strategies accordingly.

Detailed information about CVE-2025-26386: CWE-121 Stack-based Buffer Overflow in Johnson Controls iSTAR Configuration Utility (ICU) affecting Johnson Controls 

CVE-2025-26386: CWE-121 Stack-based Buffer Overflow in Johnson Controls iSTAR Configuration Utility (ICU) - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-26386: CWE-121 Stack-based Buffer Overflow in Johnson Controls iSTAR Configuration Utility (ICU)

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