# CVE-2021-3329

## Summary

- **CVE ID:** CVE-2021-3329
- **Severity:** CRITICAL
- **CVSS Score:** 9.6 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H)
- **CWE:** CWE-703
- **Published:** Feb 26, 2023
- **Last Modified:** Mar 13, 2026

## Description

Lack of proper validation in HCI Host stack initialization can cause a crash of the bluetooth stack

## Affected Products

- zephyrproject-rtos — zephyr (unspecified)

## References

- [CNA](https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-117)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.06%
- **EPSS Percentile:** 19.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._