CVE-2022-3744

UEFI variable unlocking via hard-coded SMI credential

Published Aug 23, 2023 · Updated Aug 3, 2024

Use of a hard-coded credential in LCFC BIOS for Lenovo Notebook models allows local users with elevated privileges to unlock UEFI variables. The SMI handler accepts a credential embedded in firmware instead of validating a caller-specific secret before releasing the UEFI-variable lock. Administrative local access is required; Lenovo has not disclosed which variables become writable or the resulting configuration changes.

CVSS severity6.7
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of a hard-coded credential in LCFC BIOS for Lenovo Notebook models allows local users with elevated privileges to unlock UEFI variables. The SMI handler accepts a credential embedded in firmware instead of validating a caller-specific secret before releasing the UEFI-variable lock. Administrative local access is required; Lenovo has not disclosed which variables become writable or the resulting configuration changes.

The record

CVE
CVE-2022-3744
Published
Aug 23, 2023
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

6.7Lenovo Group Ltd.CVSS: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-798Use of Hard-coded Credentials

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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