CVE-2025-4277: high-severity vulnerability in InsydeH2O
Tcg2Smm: improper input validation may lead to arbitrary code execution
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.2%
Tcg2Smm has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.
CVSS:3.1/AV:L/AC:H/PR:H/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-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%