CVE-2026-6485highCWE-489

CVE-2026-6485: high-severity vulnerability in InsydeH2O

UEFI BIOS embedded Shell can be used to bypass Secure Boot

Published · Updated

Follow this CVE+ Monitor InsydeH2O

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.2epss 0.2%
UEFI BIOS embedded Shell could be used to bypass Secure Boot via shell commands or startup scripts.
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Affected products
Insyde Software · InsydeH2O
Related CVEs — InsydeH2O

In the same product, most dangerous first.

CVE-2025-4275HIGHSecureFlashDxe: Incorrect UEFI variable attributes check allows usage of invalid certificateEPSS 0.5%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%