CVE-2022-33209Public exploit

SMM code execution via unchecked buffer copy

Published Aug 18, 2022 · Updated Feb 18, 2025

Stack overflow in Intel NUC Laptop Kit firmware before BC0076 allows local users with kernel privileges to execute code in SMM. The SmbiosElogApi.ApiFunc1 routine copies attacker-controlled data and length into a fixed stack buffer without checking the destination size. Exploitation begins from ring 0 and permits arbitrary code execution in ring -2, enabling protected NVRAM changes and a persistent BIOS implant.

CVSS severity8.2
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Intel NUC Laptop Kit firmware before BC0076 allows local users with kernel privileges to execute code in SMM. The SmbiosElogApi.ApiFunc1 routine copies attacker-controlled data and length into a fixed stack buffer without checking the destination size. Exploitation begins from ring 0 and permits arbitrary code execution in ring -2, enabling protected NVRAM changes and a persistent BIOS implant.

The record

CVE
CVE-2022-33209
Published
Aug 18, 2022
Updated
Feb 18, 2025
Vendor
Intel Corporation
Product
Intel NUC Laptop Kits
Classifications
CWE-20, CWE-121, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Feb 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=before version BC0076

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Intel Corporation · Intel NUC Laptop Kitsversion=before version BC0076

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.2Intel CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/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 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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-121Stack-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

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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