CVE-2023-4264

Memory corruption via unchecked Bluetooth buffer copies

Published Sep 26, 2023 · Updated Jun 18, 2025

Buffer overflows in Zephyr RTOS 3.4 and earlier allow attackers to corrupt memory through unchecked Bluetooth subsystem inputs. Bluetooth audio, connection, mesh, and shell routines use strcpy or memcpy to copy names, keys, confirmation values, and advertising data without destination-size enforcement. The affected paths require enabled Bluetooth features and attacker control of a copied value; successful corruption can crash the device or execute code.

CVSS severity7.1
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflows in Zephyr RTOS 3.4 and earlier allow attackers to corrupt memory through unchecked Bluetooth subsystem inputs. Bluetooth audio, connection, mesh, and shell routines use strcpy or memcpy to copy names, keys, confirmation values, and advertising data without destination-size enforcement. The affected paths require enabled Bluetooth features and attacker control of a copied value; successful corruption can crash the device or execute code.

The record

CVE
CVE-2023-4264
Published
Sep 26, 2023
Updated
Jun 18, 2025
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-122, CWE-120, CWE-121
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 2025Record 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 <=3.4

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=0 <=3.4

Published CVSS scores

9.6NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.1Zephyr ProjectCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-121Stack-based Buffer Overflow

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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