CVE-2023-39539
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAMI AptioV contains a vulnerability in BIOS where a User may cause an unrestricted upload of a PNG Logo file with dangerous type by Local access. A successful exploit of this vulnerability may lead to a loss of Confidentiality, Integrity, and/or Availability.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceAMI AptioV BIOS contains an unrestricted upload vulnerability allowing a local user to upload a PNG logo file with dangerous type. The lack of proper file validation on the logo upload mechanism permits potentially malicious content to be written to BIOS firmware, which could lead to loss of confidentiality, integrity, and availability at the firmware level.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify BIOS vendor and versionAccess BIOS setup (press Del/F2 during boot) and check the BIOS information page for vendor 'American Megatrends' (AMI) and product 'Aptio V', or use system information tools like 'dmidecode' on Linux or 'wmic bios' on Windows to retrieve BIOS version and manufacturer detailsAffected if The system runs AMI AptioV BIOS (any version)
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Check logo upload feature statusIn BIOS setup, navigate to Advanced Settings or Boot Options and look for 'Logo', 'Splash Screen', 'Boot Logo', or 'Custom Logo' settings. Check if the option to upload or select a custom logo file is present and enabledAffected if The logo upload/selection feature is available and enabled in BIOS settings
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Verify physical access controlsInspect the system environment: check if the computer is in a secured location, whether the chassis has locks, and if there are policies restricting physical access to boot sequences and BIOS configurationAffected if Physical access to the system is not properly restricted (e.g., system in public area, no chassis locks)
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Review boot audit logsCheck BIOS event logs or system boot logs for any recent changes to logo configuration, firmware updates, or BIOS setting modifications. On Linux, check /var/log/boot.log or dmesg; on Windows, check Event Viewer under System logsAffected if There are unexplained log entries related to logo changes or BIOS modifications
You are affected if your system uses AMI AptioV BIOS and the custom logo upload feature is enabled or accessible, especially if physical access controls are inadequate.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply BIOS/firmware updates from the system manufacturer when available. Until patched, restrict physical access to affected systems and disable logo upload features if possible.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-39539 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-39539 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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