CVE-2024-6443Public exploit

Device crash via empty-string pointer underflow

Published Oct 4, 2024 · Updated Oct 4, 2024

Out-of-bounds read in Zephyr RTOS 3.6 and earlier allows remote attackers to crash devices via a crafted Bluetooth preset name. utf8_trunc subtracts one from an empty string's length, placing last_byte_p before the buffer and dereferencing it after utf8_lcpy accepts a null-leading name. Exploitation requires an unauthenticated attacker within Bluetooth range to send a nonzero-length Read Preset response whose name begins with a null byte.

CVSS severity6.3
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Zephyr RTOS 3.6 and earlier allows remote attackers to crash devices via a crafted Bluetooth preset name. utf8_trunc subtracts one from an empty string's length, placing last_byte_p before the buffer and dereferencing it after utf8_lcpy accepts a null-leading name. Exploitation requires an unauthenticated attacker within Bluetooth range to send a nonzero-length Read Preset response whose name begins with a null byte.

The record

CVE
CVE-2024-6443
Published
Oct 4, 2024
Updated
Oct 4, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-787, CWE-125, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 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

6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.3Zephyr ProjectCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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