CVE-2025-4275

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

HIGH

7.8

CVSS Score

Published: June 11, 2025 at 12:25 AM UTC

Updated: June 17, 2026 at 09:32 AM UTC

1 product affected across 1 vendorInsydeH2O

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Severity

HIGH7.8

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

InsydeH2O · Insyde

60%

Kernel 5.2 ≤ v < 05.2A.16Kernel 5.3 ≤ v < 05.39.16Kernel 5.4 ≤ v < 05.47.16Kernel 5.5 ≤ v < 05.55.16Kernel 5.6 ≤ v < 05.62.16Kernel 5.7 ≤ v < 05.71.16Kernel 5.2 Kernel 5.3 Kernel 5.4 Kernel 5.5 Kernel 5.6 Kernel 5.7

Affected range stops below 05.2A.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 05.39.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 05.47.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 05.55.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 05.62.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 05.71.16, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: 8338d8cb-57f7-4252-abc0-96fd13e98d21

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

Source: af854a3a-2127-422b-91ae-364da2661108

https://www.kb.cert.org/vuls/id/211341

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHInsyde

Attack Vector: LOCAL
Complexity: HIGH
Privileges: LOW
User Interaction: NONE
Scope: CHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusDEFERRED

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