To learn more about this security vulnerability, see CVE-2020-0689 | Microsoft Secure Boot Security Feature Bypass Vulnerability. This security update addresses the vulnerability by adding the signatures of the known vulnerable UEFI modules to the DBX. An attacker who successfully exploited the vulnerability might bypass secure boot and load untrusted software. This update adds modules to the DBX.Ī security feature bypass vulnerability exists in secure boot. The Secure Boot Forbidden Signature Database (DBX) prevents UEFI modules from loading. Windows devices that has Unified Extensible Firmware Interface (UEFI) based firmware can run with Secure Boot enabled. This security update makes improvements to Secure Boot DBX for the supported Windows versions listed in the "Applies to" section. This security update applies only to the following Windows versions: IMPORTANT This article is superseded by KB5012170: Security update for Secure Boot DBX.
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