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7.8highHigh

CVE-2021-33626

Insyde Insydeh2o

A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated buffer pointer(QWORD values for CommBuffer). This can be used by an attacker to corrupt data in SMRAM memory and even lead to arbitrary code execution.

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 ordinary user account is needed.
  • Beyond that, no action by a user is required.

Scoring

CVSS
7.8 (v3.1)
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-829
Assigned by
cve@mitre.org

Dates

Published
2021-10-01
Last modified
2026-08-11
Sources
NVD

Affected products

  • Insyde Insydeh2o5.3 - 5.34.44, 5.2 - 5.25.44, 5.1 - 5.16.25, 5.4 - 5.42.44, 5.3 - 5.35.25, 5.2 - 5.26.25, 5.4 - 5.43.25
  • Siemens Ruggedcom Apr1808 Firmwareall versions
  • Siemens Ruggedcom Apr1808all versions
  • 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

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

References