Security Experts discovered a new attack method to defeat Secure Boot security mechanism of the UEFI (Unified Extensible Firmware Interface) Can be circumvented on around half of PCs that use it. The hack doesnt work on any machine because there are significant differences in how UEFI is implemented by different computer manufacturers. The researchers are now extending the test to 100,000 systems outside their organization to complete their study. Its time to consider this type of attacks seriously!”]
Source: https://securityaffairs.co/wordpress/25425/hacking/bypass-secure-boot-uefi.html