VULNERABILITY INTELLIGENCE

CVE-2021-33627

CVSS score8.2 HIGH
EPSS probability0.33%
CISA KEVNot currently listed
Published2022-02-03
Last modified2026-08-11
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

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.

Weakness classification

  • nvd@nist.gov: CWE-119

Primary references