Security Advisory

CVE-2021-33627

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2022-02-03 01:30:36

Last updated 2025-11-04 19:12:32

Assigner mitre

State PUBLISHED

Description

An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockServiceSmm. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.

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