CVE-2025-4275 - CVE House

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Status published High CVE-2025-4275

SecureFlashDxe: Incorrect UEFI variable attributes check allows usage of invalid certificate

7.8 CVSS

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Thanks to Nikolaj Schlej, independent firmware security researcher, for reporting the vulnerability and engaging in this coordinated disclosure.

References

https://www.insyde.com/security-pledge/sa-2025002/

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Affected Vendor

Insyde Software

View all reports →

Affected Software

InsydeH2O

Vulnerable Versions:

Kernel 5.2, Kernel 5.3, Kernel 5.4, Kernel 5.5, Kernel 5.6, Kernel 5.7

Timeline

Official Publish: June 11th, 2025

Last Modified: August 14th, 2025

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.