CVE-2025-4277: Insyde Software INSYDEH2O

High severity, CVSS 7.5. EPSS: 0.1% chance of exploitation in the next 30 days.

Tcg2Smm has a vulnerability which can be used to write arbitrary memory inside SMRAM and execute arbitrary code at SMM level.

Affected products

• Insyde Software INSYDEH2O

Published 2025-08-13. Last modified 2026-06-17.