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

Quick assessment

Affected
Insyde Software InsydeH2O
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Insyde InsydeH2O是中国系微（Insyde）公司的一个新的 EFI/UEFI 规范。旨在取代传统的 BIOS（基本输入/输出系统）。 Insyde InsydeH2O存在安全漏洞，该漏洞源于可更改证书并执行.efi文件。

CVSS 7.8 · High EPSS 0.44% · P37
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I. Basic Information for CVE-2025-4275

Vulnerability Information
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Vulnerability Title
SecureFlashDxe: Incorrect UEFI variable attributes check allows usage of invalid certificate
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Insyde InsydeH2O 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Insyde InsydeH2O是中国系微（Insyde）公司的一个新的 EFI/UEFI 规范。旨在取代传统的 BIOS（基本输入/输出系统）。 Insyde InsydeH2O存在安全漏洞，该漏洞源于可更改证书并执行.efi文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Insyde Software InsydeH2O Kernel 5.2 ~ 05.2A.16 -

II. Public POCs for CVE-2025-4275

# POC Description Source Link Shenlong Link
1 Binaries, drivers, PoCs and other stuff on Hydroph0bia vulnerability (CVE-2025-4275) https://github.com/NikolajSchlej/Hydroph0bia POC Details
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III. Intelligence Information for CVE-2025-4275

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IV. Related Vulnerabilities

Same product: InsydeH2O
Same vendor: Insyde Software

V. Comments for CVE-2025-4275

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