---
id: "CVE-2026-47711"
page: "https://infrastack.ai/live/CVE-2026-47711"
kind: "vulnerability"
aliases: ["CVE-2026-47711"]
title: "BACnet Stack: remote WriteProperty request crashes the demo server"
severity: "high"
cvss: 8.6
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["bacnet", "building-automation", "c", "embedded", "package"]
not_affected_if: ["not-demo-server", "patched-version"]
published_at: "2026-11-12T20:18:41+00:00"
first_seen_at: "2026-11-12T20:40:26+00:00"
updated_at: "2026-11-12T20:41:56+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47711", "first_seen_at": "2026-11-12T20:40:26+00:00"}]
exploit_sources: []
---

# BACnet Stack: remote WriteProperty request crashes the demo server

Link for people: https://infrastack.ai/live/CVE-2026-47711 (this .md is for agents)

BACnet Stack is an open source C library for BACnet building-automation devices. A valid Confirmed WriteProperty request sent over BACnet/IP can crash the master demo server.

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

## How to check

- Check the BACnet Stack version in the project's source or package manifest; affected versions are before `1.4.4`, `1.5.1` and `1.6.0`.
- Check whether the demo server build is deployed on any device reachable over BACnet/IP.

## Fix

- Upgrade to `1.4.4`, `1.5.1` or `1.6.0` (the fixed version for each release line).

## Timeline

- 2026-11-12T20:40:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-47711

## Documents

- [advisory] Vendor advisory: github.com https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-vrpm-9gm2-x552

## From the sources

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.4, 1.5.1, and 1.6.0, the current master demo server can be crashed remotely over BACnet/IP by sending a valid Confirmed WriteProperty request that updates loop-1's controlled-variable-reference to point to life-safety-zone-1 / accepted-modes. This issue has been patched in versions 1.4.4, 1.5.1, and 1.6.0.

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