CVE-2023-22330Public exploit

Privileged stack disclosure via stale DataSize

Published Aug 11, 2023 · Updated Oct 2, 2024

Use of an uninitialized resource in Intel NUC BIOS firmware allows privileged local users to disclose DXE stack memory. ProcessTcgSetup lets GetVariable enlarge DataSize, then SetVariable uses that stale size to copy bytes beyond a one-byte stack value into TpmOldvar. A privileged local user must first store an oversized TpmOldvar value and then reboot; the next boot exposes residual stack bytes through NVRAM.

CVSS severity6.0
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized resource in Intel NUC BIOS firmware allows privileged local users to disclose DXE stack memory. ProcessTcgSetup lets GetVariable enlarge DataSize, then SetVariable uses that stale size to copy bytes beyond a one-byte stack value into TpmOldvar. A privileged local user must first store an oversized TpmOldvar value and then reboot; the next boot exposes residual stack bytes through NVRAM.

The record

CVE
CVE-2023-22330
Published
Aug 11, 2023
Updated
Oct 2, 2024
Vendor
Topcon Positioning Systems, Inc.
Product
Intel NUC BIOS Firmware
Classifications
CWE-908
Attack vector
local
Privileges
admin

Timeline

How it unfolded

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

6.0Intel CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
4.4NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

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-908Use of Uninitialized Resource

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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