CVE-2025-33045

Firmware compromise via legacy serial redirection

Published Sep 9, 2025 · Updated Sep 9, 2025

Write-what-where and information disclosure flaws in AMI Aptio V before 5.040 allow local users to compromise platform firmware. The flaws reside in legacy serial redirection code operating in SMRAM, but AMI has not disclosed the affected handler or its unsafe operation. Exploitation requires high local privileges and enables arbitrary data writes and sensitive-information disclosure, affecting firmware confidentiality, integrity, and availability.

CVSS severity8.2
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Write-what-where and information disclosure flaws in AMI Aptio V before 5.040 allow local users to compromise platform firmware. The flaws reside in legacy serial redirection code operating in SMRAM, but AMI has not disclosed the affected handler or its unsafe operation. Exploitation requires high local privileges and enables arbitrary data writes and sensitive-information disclosure, affecting firmware confidentiality, integrity, and availability.

The record

CVE
CVE-2025-33045
Published
Sep 9, 2025
Updated
Sep 9, 2025
Vendor
American Megatrends International
Product
Aptio V
Classifications
CWE-123, CWE-200, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2025Record 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_5.040

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

American Megatrends International · Aptio Vversion=AptioV_5.0 <AptioV_5.040

Published CVSS scores

8.2AMICVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
6.7NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-123Write-what-where Condition
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
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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