CVE-2026-20712

Information disclosure via incomplete UEFI cleanup

Published Aug 11, 2026 · Updated Aug 11, 2026

Information disclosure in Intel UEFI Reference BIOS allows local users with high privileges to expose data through incomplete cleanup. Intel identifies the mechanism only as incomplete cleanup within UEFI and has not disclosed the affected resource or firmware path. Exploitation requires an additional attack condition and exposes subsequent-system data without direct integrity or availability impact.

CVSS severity4.0
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Intel UEFI Reference BIOS allows local users with high privileges to expose data through incomplete cleanup. Intel identifies the mechanism only as incomplete cleanup within UEFI and has not disclosed the affected resource or firmware path. Exploitation requires an additional attack condition and exposes subsequent-system data without direct integrity or availability impact.

The record

CVE
CVE-2026-20712
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Topcon Positioning Systems, Inc.
Product
Intel UEFI Reference Firmware
Classifications
CWE-459
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record 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 UEFI Reference Firmwareversion=See references

Published CVSS scores

4.0Intel CorporationCVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup

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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