CVE-2025-53696 | BDVDB-2026-287744 Detail

Johnson ControlsiSTAR Ultra

Description#

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.

Impact#

CAPEC-638 Altered Component Firmware

Weaknesses#

CWE-494 Download of Code Without Integrity Check

References#

https://raw.githubusercontent.com/reidmefirst/vuln-disclosure/refs/heads/main/2025-03.txt

Exploit#

No public exploit known

History#

Version 12025-07-28Record published in the CVE List.
Version 22025-08-19Most recent update recorded in the CVE List.

Published

Published: 2025-07-28
Last modified: 2025-08-19

Vendor information

Vendor: Johnson Controls
Product: iSTAR Ultra

All Johnson Controls vulnerabilities

Score

9.3 Critical

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 1.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
<= 6.9.2
Fixed
Not stated

Scoring System

CVSS v4.0

9.3 Critical

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Metric breakdown
Attack Vector	Local
Attack Complexity	Low
Attack Requirements	None
Privileges Required	High
User Interaction	None
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	High
Subsequent System Integrity	High
Subsequent System Availability	High

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).