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8.2highHigh

CVE-2021-33627

Insyde Insydeh2o

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.

Exploitation status

  • A vendor advisory or patch reference has been published.

What the metrics mean

  • It is requires local access to the machine.
  • For an attacker who can reach it, no special conditions are needed to exploit it.
  • To exploit it, an administrative account is needed.
  • Beyond that, no action by a user is required.

Scoring

CVSS
8.2 (v3.1)
Vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-119
Assigned by
cve@mitre.org

Dates

Published
2022-02-03
Last modified
2026-08-11
Sources
NVD

Affected products

  • Insyde Insydeh2o5.0 - 5.08.29, 5.1 - 5.16.29, 5.2 - 5.26.29, 5.3 - 5.35.29
  • Siemens Simatic Field Pg M5 Firmwareall versions
  • Siemens Simatic Field Pg M5all versions
  • Siemens Simatic Field Pg M6 Firmwareall versions
  • Siemens Simatic Field Pg M6all versions
  • Siemens Simatic Ipc127e Firmwareall versions
  • Siemens Simatic Ipc127eall versions
  • Siemens Simatic Ipc227g Firmwareall versions
  • Siemens Simatic Ipc227gall versions
  • Siemens Simatic Ipc277g Firmwareall versions
  • Siemens Simatic Ipc277gall versions
  • Siemens Simatic Ipc327g Firmwareall versions

As listed in the NVD configuration data. Not a statement about your estate.

References