CVE-2023-27373: Insyde INSYDEH2O

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

An issue was discovered in Insyde InsydeH2O with kernel 5.0 through 5.5. Due to insufficient input validation, an attacker can tamper with a runtime-accessible EFI variable to cause a dynamic BAR setting to overlap SMRAM.

Affected products

• Insyde INSYDEH2O: version 5.0 only; version 5.1 only; version 5.2 only; version 5.3 only; version 5.4 only; version 5.5 only

Published 2023-08-07. Last modified 2026-06-17.