CVE-2025-4275: high-severity vulnerability in InsydeH2O
SecureFlashDxe: Incorrect UEFI variable attributes check allows usage of invalid certificate
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.5%
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.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Insyde Software · InsydeH2ORelated CVEs — InsydeH2O
In the same product, most dangerous first.
CVE-2026-6484HIGHLack of verified boot to certain FV may cause arbitrary code executionEPSS 0.4%CVE-2025-4421HIGHEfiSmiServices: gEfiSmmCpuProtocol, SMM memory corruption vulnerabilities in SMM moduleEPSS 0.2%CVE-2025-4422HIGHEfiSmiServices : EfiPcdProtocol, SMM memory corruption vulnerabilities in SMM moduleEPSS 0.2%CVE-2025-4426MEDIUMSetupAutomationSmm : SMRAM memory contents leak / information disclosure vulnerability in SMM moduleEPSS 0.2%CVE-2025-4425HIGHSetupAutomationSmm: Stack overflow vulnerability in SMI handlerEPSS 0.2%CVE-2025-4423HIGHSetupAutomationSmm:Vulnerability in the SMM module allow attacker to write arbitrary code and lead to memory corruptionEPSS 0.2%