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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11LogoFAIL is a family of vulnerabilities in UEFI firmware image parsers—not a flaw that affects every Windows or Linux computer. A specially crafted boot-logo image can exploit vulnerable firmware while it is processing the image early in startup, before the operating system and many endpoint security tools load. Whether a particular PC or server is exposed depends on its firmware supplier, OEM customizations, exact model, and installed firmware version. The practical response is to check the device maker’s advisory for that model and install its approved firmware update.
What is LogoFAIL?
LogoFAIL is the name given to vulnerabilities in image-parsing code used by some UEFI firmware implementations to process customizable boot logos. UEFI firmware runs before the operating system, and its logo parser operates with high privileges. CERT/CC warns that crafted image data may let an attacker access or change privileged UEFI settings. The issue is therefore in firmware image handling, not in the logo displayed by Windows or Linux after startup. CERT/CC VU#811862
The EFI System Partition (ESP) can contain boot loaders, applications, drivers, and customizable settings, including image files used during boot. CERT/CC notes that the ESP is protected from unprivileged access. Some firmware updates may also bundle an image that could trigger a vulnerable parser if it is corrupt or malicious; this does not mean ordinary firmware updates are unsafe, but it is another reason to use only the update supplied by the device maker for the exact model.
Why can LogoFAIL evade operating-system security tools?
LogoFAIL exploitation can occur in the UEFI Driver Execution Environment (DXE), before the operating system and its endpoint agents start. That early execution means conventional OS-level protection may not see the initial activity. It does not mean every exploit is remotely deliverable or that an attacker can compromise a device simply by showing it an image on a website. The image must reach a vulnerable firmware parser through an available path, and the attacker must have whatever access that implementation requires. Eclypsium’s LogoFAIL overview
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Is my laptop or server affected by LogoFAIL?
There is no reliable all-devices list implied by the name. CERT/CC maps the reported CVEs to firmware suppliers AMI, Insyde, and Phoenix, but the impact depends on the firmware integration and OEM customizations in a particular product. CERT/CC’s vendor table contains differing affected, unknown, and not-affected statuses for specific suppliers and products; a status for one product should not be generalized to every system from the same OEM. The note was first released on December 6, 2023, and last revised September 23, 2025. CERT/CC VU#811862
For example, Insyde told CERT/CC that certain OEM products using customized InsydeH2O firmware are affected. Phoenix said its base product was not believed to be affected, while also reporting that client products with affected customer extensions had been observed and that updates had been provided to customers. These statements distinguish base firmware from customized shipping products; they do not establish the status of an unspecified computer.
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Eclypsium’s December 2023 article named Lenovo, Dell, and HP among manufacturers with affected products or products being assessed at that time. That is a historical snapshot, not a current or exhaustive list of affected models. Its article also explains that severity depends on how firmware vendors and device makers store and process logos, as well as an attacker’s ability to alter an image or its path.
What to check
- Find the exact computer or server model and its installed BIOS/UEFI version.
- Search the manufacturer’s current product-security advisory for that model and the relevant LogoFAIL CVE or advisory.
- Check the advisory’s status and recommended firmware version for your model rather than relying on a brand-level claim or an old list.
What access would an attacker need?
The required access varies with the device’s implementation. CERT/CC says the ESP is protected from unprivileged access. Eclypsium describes scenarios in which changing an image file or its path may require local administrator or root privileges, remote access, or physical access. Those are implementation-dependent possibilities, not a single universal attack route. The available evidence does not establish that an ordinary website visit alone is sufficient to install a malicious boot logo.
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How do I update BIOS or UEFI to address LogoFAIL?
- Identify the device. Record the exact model and current BIOS/UEFI version using the manufacturer’s documented method for that computer.
- Open the OEM’s current security advisory or support page. Confirm that it covers your model and the relevant LogoFAIL issue, and note the firmware version or package it specifies.
- Download the update from the device manufacturer. Use only the firmware package and instructions intended for your exact model; do not substitute third-party firmware or programmer tools.
- Install it according to the OEM’s instructions. Follow any stated prerequisites and restart or verify the installed firmware version as directed.
- If no model-specific entry is clear, contact the manufacturer or administrator. A missing or unclear listing is not proof that the device is affected or unaffected.
Lenovo’s advisory lists CVE-2023-5058, CVE-2023-39538, CVE-2023-39539, and CVE-2023-40238 and directs customers to the firmware version indicated for their specific model. Lenovo security advisory HP’s advisory says certain HP PC products using AMI or Insyde BIOS may be affected and recommends current firmware/software and the relevant SoftPaq. HP security advisory Advisory coverage and download availability can change, so consult the live OEM page.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should IT teams do for an enterprise fleet?
Fleet exposure cannot be assessed from the PC brand alone. Track the firmware supplier and customized firmware lineage where known, the exact OEM model and installed version, the vendor’s current status and fix availability, and the access needed to alter the boot image or its path. Use those details to prioritize review and coordinate approved firmware deployment through normal change controls. Firmware-detection or update-automation services may help with inventory, but they do not replace confirmation against the OEM’s advisory for each model.
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No population-wide affected-device count is established by the cited advisories. Treat any percentage or broad claim about how many computers are vulnerable cautiously unless it is supported by a primary source and clearly defines the devices measured.
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