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iSTAR Ultra performs a firmware verification on boot, however the verification does not inspect certain portions of the firmware. These firmware parts may contain malicious code. Tested up to firmware 6.9.2, later firmwares are also possibly affected.

CVE-2025-53696 is a critical vulnerability identified in the Johnson Controls, Inc iSTAR Ultra access control system firmware. The vulnerability is categorized under CWE-494, which involves the download of code without integrity verification. Specifically, while the iSTAR Ultra firmware performs a verification process during device boot, this verification does not cover certain portions of the firmware image. These unchecked portions can potentially harbor malicious code that remains undetected during the boot verification process. The vulnerability has been tested up to firmware version 6.9.2, with indications that later firmware versions may also be affected. The CVSS 4.0 base score of 9.3 reflects a critical severity, highlighting the high impact and exploitability of this flaw. The vector metrics indicate that exploitation requires local access (AV:L), low attack complexity (AC:L), no user interaction (UI:N), and high privileges (PR:H). The vulnerability impacts confidentiality, integrity, and availability at a high level, with a broad scope affecting the entire system. Although no known exploits are currently reported in the wild, the nature of the vulnerability allows an attacker with high privileges and local access to inject malicious code into the firmware, potentially leading to persistent compromise, unauthorized control over physical access systems, and disruption of security operations. Given that iSTAR Ultra is a widely deployed access control platform used in critical infrastructure, commercial buildings, and government facilities, this vulnerability poses a significant risk to the security posture of affected organizations.

Detailed information about CVE-2025-53696: CWE-494 Download of Code Without Integrity Check in Johnson Controls, Inc iSTAR Ultra affecting Johnson Controls, Inc

CVE-2025-53696: CWE-494 Download of Code Without Integrity Check in Johnson Controls, Inc iSTAR Ultra - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-53696: CWE-494 Download of Code Without Integrity Check in Johnson Controls, Inc iSTAR Ultra

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