---
id: "CVE-2025-53699"
page: "https://infrastack.ai/live/CVE-2025-53699"
kind: "vulnerability"
aliases: ["CVE-2025-53699"]
title: "Johnson Controls iSTAR door controllers: alternate hardware interface bypasses functionality"
severity: "high"
cvss: 7.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["access-control", "infrastructure", "istar", "johnson-controls", "physical-security"]
not_affected_if: ["fixed-version-installed", "not-istar-hardware"]
published_at: "2026-11-13T22:17:18+00:00"
first_seen_at: "2026-11-13T22:33:33+00:00"
updated_at: "2026-11-13T22:34:30+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53699", "first_seen_at": "2026-11-13T22:33:33+00:00"}]
exploit_sources: []
---

# Johnson Controls iSTAR door controllers: alternate hardware interface bypasses functionality

Link for people: https://infrastack.ai/live/CVE-2025-53699 (this .md is for agents)

Johnson Controls iSTAR Ultra, Ultra SE, Ultra G2, Ultra G2 SE and Edge G2 access control units have a missing protection on an alternate hardware interface. The sources say this allows a functionality bypass (CAPEC-554), so an attacker with physical or hardware access could get around intended controls.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed iSTAR software or controller firmware version against the affected range below.
- Identify whether any iSTAR Ultra, Ultra SE, Ultra G2, Ultra G2 SE or Edge G2 units are deployed in your building or network.
- Review the vendor's advisory for the alternate hardware interface and whether it is reachable on your units.

## Fix

- iSTAR Ultra: move to `6.9.2.CU02` or later
- iSTAR Ultra SE: move to `6.9.2.CU02` or later
- iSTAR Ultra G2: move to `6.9.2.CU02` or later
- iSTAR Ultra G2 SE: move to `6.9.2.CU02` or later
- iSTAR Edge G2: move to `6.9.2.CU02` or later

## Timeline

- 2026-11-13T22:33:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-53699

## From the sources

Missing protection mechanism for alternate hardware interface vulnerability in Johnson Controls iSTAR Ultra, Johnson Controls iSTAR Ultra SE, Johnson Controls iSTAR Ultra G2, Johnson Controls iSTAR Ultra G2 SE, and Johnson Controls iSTAR Edge G2 allows CAPEC‑554: Functionality Bypass.

This issue affects iSTAR Ultra: before 6.9.2.CU02; iSTAR Ultra SE: before 6.9.2.CU02; iSTAR Ultra G2: before 6.9.2.CU02; iSTAR Ultra G2 SE: before 6.9.2.CU02; iSTAR Edge G2: before 6.9.2.CU02.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_