CVE-2026-33197Public exploit

Secure Boot bypass via incomplete shell-entry removal

Published Sep 8, 2026 · Updated Sep 8, 2026

Incomplete input filtering in Aptio V before 5.044 allows local users with high privileges to bypass Secure Boot and execute code. The BDS module removes only one matching UEFI Shell boot option, so a duplicate entry survives and launches the trusted shell. The attacker must modify UEFI boot entries; the shell can then overwrite Secure Boot state in physical memory and run persistent code before the operating system loads.

CVSS severity8.7
High
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

Incomplete input filtering in Aptio V before 5.044 allows local users with high privileges to bypass Secure Boot and execute code. The BDS module removes only one matching UEFI Shell boot option, so a duplicate entry survives and launches the trusted shell. The attacker must modify UEFI boot entries; the shell can then overwrite Secure Boot state in physical memory and run persistent code before the operating system loads.

The record

CVE
CVE-2026-33197
Published
Sep 8, 2026
Updated
Sep 8, 2026
Vendor
American Megatrends International
Product
Aptio V
Classifications
CWE-184, T1542.003
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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?

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

  1. Affected versionversion=AptioV_5.0 <AptioV_5.044

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

American Megatrends International · Aptio Vversion=AptioV_5.0 <AptioV_5.044

Published CVSS scores

8.7AMICVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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 exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
T1542.003Pre-OS Boot: Bootkit

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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