ESET researchers discovered 11 outdated UEFI shim bootloaders signed by Microsoft that can bypass UEFI Secure Boot on most UEFI-based systems, allowing attackers to run malicious code during boot. These vulnerabilities affect any system trusting Microsoft's third-party UEFI certificate, regardless of the installed OS, and can be exploited by bringing vulnerable binaries to the system. Microsoft has revoked the vulnerable shims, and users should apply updates to protect their devices. Windows updates are automatic, while Linux users should update via the Linux Vendor Firmware Service. This discovery highlights risks in outdated security components that remain trusted by systems.
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