CVE-2023-4424

Device crash via undersized Bluetooth advertisements

Published Nov 21, 2023 · Updated Aug 2, 2024

Buffer overflow in Zephyr RTOS 3.4 and earlier allows physically proximate attackers to crash devices via malformed BLE advertisements. The le_advertising_report, le_mesh_scan_report, and le_ext_adv_legacy_report paths subtract the six-byte address size from an unchecked shorter PDU length, wrap the result in an eight-bit value, and copy that oversized length into a smaller HCI event buffer. The flaw is reachable within BLE radio range without authentication; the resulting memory corruption interrupts service and can enable code execution when the overwritten layout is security-relevant.

CVSS severity8.3
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Zephyr RTOS 3.4 and earlier allows physically proximate attackers to crash devices via malformed BLE advertisements. The le_advertising_report, le_mesh_scan_report, and le_ext_adv_legacy_report paths subtract the six-byte address size from an unchecked shorter PDU length, wrap the result in an eight-bit value, and copy that oversized length into a smaller HCI event buffer. The flaw is reachable within BLE radio range without authentication; the resulting memory corruption interrupts service and can enable code execution when the overwritten layout is security-relevant.

The record

CVE
CVE-2023-4424
Published
Nov 21, 2023
Updated
Aug 2, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-400, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=* <3.5

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=* <3.5

Published CVSS scores

8.3GitHubCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/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-400Uncontrolled Resource Consumption
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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