CVE-2023-34349

Privilege escalation via alternate-channel race condition

Published Aug 11, 2023 · Updated Oct 1, 2024

A race condition in Intel NUC BIOS firmware allows local users with high privileges to escalate privileges through local access. Intel identifies a race during access to an alternate channel but does not disclose the affected firmware locus or competing operations. Exploitation requires high local privileges; published impact is limited to confidentiality and integrity loss, with no availability impact.

CVSS severity4.6
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Intel NUC BIOS firmware allows local users with high privileges to escalate privileges through local access. Intel identifies a race during access to an alternate channel but does not disclose the affected firmware locus or competing operations. Exploitation requires high local privileges; published impact is limited to confidentiality and integrity loss, with no availability impact.

The record

CVE
CVE-2023-34349
Published
Aug 11, 2023
Updated
Oct 1, 2024
Vendor
Topcon Positioning Systems, Inc.
Product
Intel NUC BIOS Firmware
Classifications
CWE-362, CWE-421, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

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

Compare these published version ranges with your installed build and any vendor patches.

  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

6.4NIST NVDCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
4.6Intel CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/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.

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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-421Race Condition During Access to Alternate Channel
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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