CVE-2024-3332

BLE peripheral crash via stale connection dereference

Published Jul 3, 2024 · Updated Aug 1, 2024

NULL pointer dereference in Zephyr RTOS 3.6 and earlier allows physically proximate attackers to crash BLE peripherals with crafted packets. The Bluetooth SMP error path calls bt_conn_send_cb with smp->chan.chan.conn after asynchronous disconnect cleanup has set that connection pointer to NULL. The race requires LE Secure Connections in Just Works mode, a controller without ECC support, and precisely timed DHKey Check and termination packets.

CVSS severity6.5
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Zephyr RTOS 3.6 and earlier allows physically proximate attackers to crash BLE peripherals with crafted packets. The Bluetooth SMP error path calls bt_conn_send_cb with smp->chan.chan.conn after asynchronous disconnect cleanup has set that connection pointer to NULL. The race requires LE Secure Connections in Just Works mode, a controller without ECC support, and precisely timed DHKey Check and termination packets.

The record

CVE
CVE-2024-3332
Published
Jul 3, 2024
Updated
Aug 1, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-476, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.6
  2. Affected versionversion=* <=3.6

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=0 <=3.6; version=* <=3.6

Published CVSS scores

6.5Zephyr ProjectCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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