CVE-2023-22449

Firmware code execution via reused GetVariable length

Published Aug 11, 2023 · Updated Oct 9, 2024

Stack-based buffer overflow in Intel NUC BIOS firmware allows local users with high privileges to execute code in a UEFI DXE driver. HandleTpm12VersionInfoAndPCRBitmap reuses a length variable after Tpm12VersionInfo can replace it with an attacker-controlled value, causing a later PCRBitmap GetVariable call to overflow a 20-byte stack buffer. Successful exploitation crosses from the operating system into firmware execution and permits persistent code or NVRAM modification across system boots.

CVSS severity7.5
High
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

Stack-based buffer overflow in Intel NUC BIOS firmware allows local users with high privileges to execute code in a UEFI DXE driver. HandleTpm12VersionInfoAndPCRBitmap reuses a length variable after Tpm12VersionInfo can replace it with an attacker-controlled value, causing a later PCRBitmap GetVariable call to overflow a 20-byte stack buffer. Successful exploitation crosses from the operating system into firmware execution and permits persistent code or NVRAM modification across system boots.

The record

CVE
CVE-2023-22449
Published
Aug 11, 2023
Updated
Oct 9, 2024
Vendor
Topcon Positioning Systems, Inc.
Product
Intel NUC BIOS Firmware
Classifications
CWE-20, T1542.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 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?

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  1. Affected versionversion=See references

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Topcon Positioning Systems, Inc. · Intel NUC BIOS Firmwareversion=See references

Published CVSS scores

8.2BinarlyCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.5IntelCVSS:3.1/AV:L/AC:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1542.001Pre-OS Boot: System Firmware

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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