CVE-2025-21194

FAQ

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires multiple conditions to be met, such as specific application behavior, user actions, manipulation of parameters passed to a function, and impersonation of an integrity level token.

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

Successful exploitation of this vulnerability requires that an attacker will need to first gain access to the restricted network before running an attack.

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

This Hypervisor vulnerability relates to Virtual Machines within a Unified Extensible Firmware Interface (UEFI) host machine. On some specific hardware it might be possible to bypass the UEFI, which could lead to the compromise of the hypervisor and the secure kernel.

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?

Successful exploitation of this vulnerability by an attacker requires a user to first reboot their machine.

What actions do customers need to perform to be protected against this vulnerability?

Surface devices get updates through Windows Update. See Surface update history for more information.

If you wish to install the updates manually, you can do the following:

1. In the Surface app, expand Help & support to check the update status.
2. If there are updates available, select the Check for updates button to open Windows Update and install the available updates.