CVE-2023-43567

Firmware code execution via LemSecureBootForceKey buffer overflow

Published Nov 8, 2023 · Updated Sep 12, 2024

Buffer overflow in Lenovo Desktop BIOS allows local users with elevated privileges to execute arbitrary code in system firmware. The LemSecureBootForceKey module contains the overflow, but Lenovo has not disclosed the affected copy operation or attacker-controlled input. Administrative local access is required; successful exploitation executes code in the firmware context and can compromise the system.

CVSS severity6.7
Medium
EPSS probability0.23%
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 Desktop BIOS allows local users with elevated privileges to execute arbitrary code in system firmware. The LemSecureBootForceKey module contains the overflow, but Lenovo has not disclosed the affected copy operation or attacker-controlled input. Administrative local access is required; successful exploitation executes code in the firmware context and can compromise the system.

The record

CVE
CVE-2023-43567
Published
Nov 8, 2023
Updated
Sep 12, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.7LenovoCVSS: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.

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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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1068Exploitation for Privilege Escalation

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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