# CVE-2026-47711: BACnet Stack stack buffer overflow in life-safety-zone property read

Source: https://junglewise.ai/threats/cve-2026-47711-bacnet-stack-is-a-bacnet-open-source-protocol-stack-c-library-for  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-12. Updated: 2026-11-12  
License: CC BY 4.0 with a link back

CVE-2026-47711 · Severity: high · CVSS 8.6 · Published 2026-11-12

BACnet Stack is a C library implementing the BACnet building automation protocol, commonly used in HVAC and security systems. A remote attacker can crash the demo server by sending a specially crafted network request that triggers a memory corruption vulnerability, causing the system to crash and potentially allowing code execution.

Technologies: [BACnet Stack](https://junglewise.ai/threats/technologies/bacnet-stack-bacnet-stack). Vendors: [BACnet Stack](https://junglewise.ai/threats/vendors/bacnet-stack).

## Quick answers

**Is CVE-2026-47711 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-47711 being exploited in the wild.

**How severe is CVE-2026-47711?** High severity, with a CVSS score of 8.6, published 12 November 2026.

**Which products and versions are affected?** BACnet Stack prior to 1.4.4, 1.5.1, and 1.6.0.

**Is there a fix for CVE-2026-47711?** Yes: fixed in 1.4.4, 1.5.1, 1.6.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-47711 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-47711?** Check whether you run BACnet Stack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 1.4.4, 1.5.1, 1.6.0

## Technical details

A stack buffer overflow exists in the Life_Safety_Zone property reading code path within the Loop object's timer callback. When a remote client sends a WriteProperty request to set loop-1's controlled-variable-reference to point to life-safety-zone-1's accepted-modes property, the subsequent timer tick calls Loop_Read_Variable_Reference_Update() which allocates a fixed 32-byte buffer, but Life_Safety_Zone_Read_Property() writes an unbounded number of enumerated values without length checking, overflowing the stack. The vulnerability is network-reachable on the default BACnet/IP demo server without requiring authentication.

## Affected products

- BACnet Stack BACnet Stack prior to 1.4.4, 1.5.1, and 1.6.0

## Timeline

- 2026-07-05: disclosed
- 2026-11-12: advisory

## References

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

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