CVE-2022-1891

Firmware code execution via SystemLoadDefaultDxe heap overflow

Published Jan 23, 2023 · Updated Apr 3, 2025

Heap-based buffer overflow in Lenovo Notebook BIOS allows local users with high privileges to execute arbitrary code in firmware. The SystemLoadDefaultDxe driver writes beyond a heap buffer, although Lenovo has not disclosed the input or copy operation that triggers the overwrite. Exploitation requires existing high local privileges and can compromise firmware-level code execution on an affected notebook.

CVSS severity6.7
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Lenovo Notebook BIOS allows local users with high privileges to execute arbitrary code in firmware. The SystemLoadDefaultDxe driver writes beyond a heap buffer, although Lenovo has not disclosed the input or copy operation that triggers the overwrite. Exploitation requires existing high local privileges and can compromise firmware-level code execution on an affected notebook.

The record

CVE
CVE-2022-1891
Published
Jan 23, 2023
Updated
Apr 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-122, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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?

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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.

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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based 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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