CVE-2024-6442Public exploit

Device crash via unchecked ASCS response growth

Published Oct 4, 2024 · Updated Oct 4, 2024

Out-of-bounds write in Zephyr RTOS 3.6 and earlier allows physically proximate attackers to crash devices via Bluetooth LE Audio requests. ascs_cp_rsp_add appends three-byte ASE responses to the static rsp_buf without checking remaining tailroom as attacker-controlled num_ases drives repeated calls. Exposure requires the Bluetooth Audio Stream Control Service; overflowing the global buffer can destabilize or crash the device.

CVSS severity6.3
Medium
EPSS probability0.34%
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 write in Zephyr RTOS 3.6 and earlier allows physically proximate attackers to crash devices via Bluetooth LE Audio requests. ascs_cp_rsp_add appends three-byte ASE responses to the static rsp_buf without checking remaining tailroom as attacker-controlled num_ases drives repeated calls. Exposure requires the Bluetooth Audio Stream Control Service; overflowing the global buffer can destabilize or crash the device.

The record

CVE
CVE-2024-6442
Published
Oct 4, 2024
Updated
Oct 4, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-787, T1499
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

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

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

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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