CVE-2021-42554 - CVE House
Back to Database
Status published High CVE-2021-42554

An issue was discovered in Insyde InsydeH2O with Kernel 5.0...

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-42554

Credits & Attribution

No credits recorded in the NVD database.

References

More from insyde

View All →
CVE-2022-46897
An issue was discovered in Insyde InsydeH2O with kernel 5.0...
Unknown 0
CVE-2022-36448
An issue was discovered in Insyde InsydeH2O with kernel 5.0...
Unknown 0
CVE-2022-36338
An issue was discovered in Insyde InsydeH2O with kernel 5.0...
Unknown 0
CVE-2022-36337
An issue was discovered in Insyde InsydeH2O with kernel 5.0...
Unknown 0
CVE-2022-35897
An stack buffer overflow vulnerability leads to arbitrary code execution...
Unknown 0

Affected Vendor

Affected Software

insydeh2o, simatic field pg m5 firmware, simatic field pg m6 firmware, simatic ipc127e firmware, simatic ipc227g firmware, simatic ipc277g firmware, simatic ipc327g firmware, simatic ipc377g firmware, simatic ipc427e firmware, simatic ipc477e firmware, simatic ipc627e firmware, simatic ipc647e firmware, simatic ipc677e firmware, simatic ipc847e firmware, simatic itp1000 firmware, ruggedcom ape1808 firmware
Vulnerable Versions:
5.0, 5.1, 5.2, 5.3, 5.4, 5.5

Timeline

Official Publish: February 3rd, 2022
Last Modified: November 4th, 2025
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.