CVE-2023-4029

Privileged code execution via unchecked buffer copy

Published Aug 17, 2023 · Updated Oct 8, 2024

Buffer overflow in Lenovo ThinkPad BoardUpdateAcpiDxe firmware allows local users with elevated privileges to execute arbitrary code. The driver copies data without checking the destination buffer size, but Lenovo has not disclosed the affected entry point, input field, or overwrite path. Exploitation requires local access and elevated privileges; successful execution can compromise firmware-context confidentiality, integrity, and availability.

CVSS severity6.7
Medium
EPSS probability0.19%
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 Lenovo ThinkPad BoardUpdateAcpiDxe firmware allows local users with elevated privileges to execute arbitrary code. The driver copies data without checking the destination buffer size, but Lenovo has not disclosed the affected entry point, input field, or overwrite path. Exploitation requires local access and elevated privileges; successful execution can compromise firmware-context confidentiality, integrity, and availability.

The record

CVE
CVE-2023-4029
Published
Aug 17, 2023
Updated
Oct 8, 2024
Vendor
Lenovo
Product
ThinkPad
Classifications
CWE-120
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 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 <*
  2. Affected versionversion=various

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Lenovo · ThinkPadversion=0 <*; version=various

Published CVSS scores

6.7Lenovo Group Ltd.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/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.

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

No observations available

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

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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