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Are there any real examples (malware, rootkits, etc.) of exploiting the UEFI secure boot mechanism vulnerabilities such as CVE-2022-21894?

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  • CVE-2022-21894 is not a secure boot vulnerability. It is a Windows bootloader vulnerability that allows bypassing security boot. Commented Mar 2, 2023 at 15:22

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Just recently BlackLotus UEFI bootkit has been discovered which not only exploits this vulnerability, it does a ton more to gain persistence (complete system reinstallation will not help - you'll have to reset MOK keys and probably even reflash BIOS) it disables multiple Windows 11 protections to remain completely undetected.

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