CVE WatchAug 11, 2026

CVE-2021-33625

An issue was discovered in Kernel 5.x in Insyde InsydeH2O, affecting HddPassword. Software SMI services that use the Communicate() function

CVSS

7.5

High

EPSS

0.3%

p24

KEV

—

Exploit Today

0-100

Published: Feb 3, 2022 · Last modified: Aug 11, 2026 · CWE-119

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-142026-09-11

Technical description

An issue was discovered in Kernel 5.x in Insyde InsydeH2O, affecting HddPassword. 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.

Official references

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