CVE-2025-33044

Local firmware memory corruption via exFAT handling

Published Oct 14, 2025 · Updated Oct 14, 2025

Memory bounds corruption in American Megatrends International Aptio V allows local users to corrupt BIOS memory via exFAT processing. AMI identifies only exFAT handling and has not disclosed the parser routine, malformed structure, or incorrect memory operation involved. Exploitation requires local low-privilege access and additional platform conditions; success can alter firmware memory or make firmware unavailable.

CVSS severity5.9
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory bounds corruption in American Megatrends International Aptio V allows local users to corrupt BIOS memory via exFAT processing. AMI identifies only exFAT handling and has not disclosed the parser routine, malformed structure, or incorrect memory operation involved. Exploitation requires local low-privilege access and additional platform conditions; success can alter firmware memory or make firmware unavailable.

The record

CVE
CVE-2025-33044
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
American Megatrends International
Product
Aptio V
Classifications
CWE-119
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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 privilegesauthenticated

What is affected?

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

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.9AMICVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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