CVE-2024-26240

FAQ

According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability?

An authenticated attacker could exploit this vulnerability with LAN access.

How could an attacker successfully exploit this vulnerability?

To exploit the vulnerability, an attacker who has physical access or Administrative rights to a target device could install a malicious .bcd file.

What kind of security feature could be bypassed by successfully exploiting this vulnerability?

An attacker who successfully exploited this vulnerability could bypass Secure Boot.

According to the CVSS metric, user interaction is required (UI:R) and privileges required are none (PR:N). What does that mean for this vulnerability?

An unauthorized attacker must wait for a user to initiate a connection.

Are there additional steps I need to take to be protected from this vulnerability?

All customers should apply the April 9, 2024 Windows security updates. These security updates address this vulnerability by updating the Windows Boot Manager and other components, but the protections are not enabled by default. Additional steps are required at this time to mitigate this vulnerability. Please refer to KB5025885: How to manage the Windows Boot Manager revocations for Secure Boot changes associated with CVE-2023-24932. This article describes the protection against this Secure Boot security feature bypass, how to enable the protections, and guidance to update bootable media.