CVE-2025-4275 HIGH

CVE-2025-4275: SecureFlashDxe: Incorrect UEFI variable attributes check allows usage of invalid certificate

Vendor Insyde Software
Product InsydeH2O
Published June 11, 2025
Last update August 14, 2025

CVSS base score

7.8/10
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

A vulnerability in the digital signature verification process does not properly validate variable attributes which allows an attacker to bypass signature verification by creating a non-authenticated NVRAM variable. An attacker may to execute arbitrary signed UEFI code and bypass Secure Boot.

Key dates

02Disclosure timeline

June 11, 2025 CVE published
August 14, 2025 Record updated