CVE-2021-42554

Published: Feb 3, 2022Updated: Aug 11, 2026 Sources: CVE List NVD BDUCWE-787

8.2HIGH

NVD MITRE

Description

An issue was discovered in Insyde InsydeH2O with Kernel 5.0 before 05.08.42, Kernel 5.1 before 05.16.42, Kernel 5.2 before 05.26.42, Kernel 5.3 before 05.35.42, Kernel 5.4 before 05.42.51, and Kernel 5.5 before 05.50.51. An SMM memory corruption vulnerability in FvbServicesRuntimeDxe allows a possible attacker to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:LAttack Vector

Local

AC:LAttack Complexity

Low

PR:HPrivileges Required

High

UI:NUser Interaction

None

Scope

S:CScope

Changed

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-787

Affected Products

siemens

commercial·DEaka siemens ag

simatic field pg m5 firmware

ICS / OT / IoT

simatic field pg m6 firmware

ICS / OT / IoT

simatic ipc127e firmware

ICS / OT / IoT

simatic ipc227g firmware

ICS / OT / IoT

simatic ipc277g firmware

ICS / OT / IoT

simatic ipc327g firmware

ICS / OT / IoT

simatic ipc377g firmware

ICS / OT / IoT

simatic ipc427e firmware

ICS / OT / IoT

Insyde

commercial·TWaka insydeh2o

InsydeH2OEmbeddedFirmware

Hardware Firmware / bios-uefi

and 9 more affected products View all →

Exploitability

Official Patch Available

Is your org exposed to CVE-2021-42554?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

Privilege Escalation

View detailed technique mapping

References

https://www.insyde.com/security-pledge

insyde.com

https://www.insyde.com/security-pledge/SA-2022012

insyde.com

https://security.netapp.com/advisory/ntap-20220216-0007/

security.netapp.com

and 3 more references View all →

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