CVE-2023-39283: Insyde INSYDEH2O

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

An SMM memory corruption vulnerability in the SMM driver (SMRAM write) in CsmInt10HookSmm in Insyde InsydeH2O with kernel 5.0 through 5.5 allows attackers to send arbitrary data to SMM which could lead to privilege escalation.

Affected products

• Insyde INSYDEH2O: from 5.0, up to and including 5.5; version 5.5.05.53.22 only; version 5.6 only; version 5.6.05.60.22 only

Published 2023-11-02. Last modified 2026-06-17.