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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Local

Access Complexity Low

Authentication None

Confidentiality Impact Complete

Integrity Impact Complete

Availability Impact Complete

This CVE is not in the KEV list.

The EPSS score is 0.00155.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a n/a affected
Version Status Constraints
n/a affected —

Configuration 1 [-]

cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 2 [-]

cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 3 [-]

cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 4 [-]

cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 5 [-]

AND
cpe:2.3:o:siemens:simatic_field_pg_m5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_field_pg_m5:-:*:*:*:*:*:*:*

Configuration 6 [-]

AND
cpe:2.3:o:siemens:simatic_field_pg_m6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_field_pg_m6:-:*:*:*:*:*:*:*

Configuration 7 [-]

AND
cpe:2.3:o:siemens:simatic_ipc127e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc127e:-:*:*:*:*:*:*:*

Configuration 8 [-]

AND
cpe:2.3:o:siemens:simatic_ipc227g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc227g:-:*:*:*:*:*:*:*

Configuration 9 [-]

AND
cpe:2.3:o:siemens:simatic_ipc277g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc277g:-:*:*:*:*:*:*:*

Configuration 10 [-]

AND
cpe:2.3:o:siemens:simatic_ipc327g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc327g:-:*:*:*:*:*:*:*

Configuration 11 [-]

AND
cpe:2.3:o:siemens:simatic_ipc377g_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc377g:-:*:*:*:*:*:*:*

Configuration 12 [-]

AND
cpe:2.3:o:siemens:simatic_ipc427e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc427e:-:*:*:*:*:*:*:*

Configuration 13 [-]

AND
cpe:2.3:o:siemens:simatic_ipc477e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc477e:-:*:*:*:*:*:*:*

Configuration 14 [-]

AND
cpe:2.3:o:siemens:simatic_ipc627e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc627e:-:*:*:*:*:*:*:*

Configuration 15 [-]

AND
cpe:2.3:o:siemens:simatic_ipc647e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc647e:-:*:*:*:*:*:*:*

Configuration 16 [-]

AND
cpe:2.3:o:siemens:simatic_ipc677e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc677e:-:*:*:*:*:*:*:*

Configuration 17 [-]

AND
cpe:2.3:o:siemens:simatic_ipc847e_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_ipc847e:-:*:*:*:*:*:*:*

Configuration 18 [-]

AND
cpe:2.3:o:siemens:simatic_itp1000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_itp1000:-:*:*:*:*:*:*:*

No data.

No data.

Project Subscriptions

Vendors Products
Insyde Subscribe
Insydeh2o Subscribe
Siemens Subscribe
Simatic Field Pg M5 Subscribe
Simatic Field Pg M5 Firmware Subscribe
Simatic Field Pg M6 Subscribe
Simatic Field Pg M6 Firmware Subscribe
Simatic Ipc127e Subscribe
Simatic Ipc127e Firmware Subscribe
Simatic Ipc227g Subscribe
Simatic Ipc227g Firmware Subscribe
Simatic Ipc277g Subscribe
Simatic Ipc277g Firmware Subscribe
Simatic Ipc327g Subscribe
Simatic Ipc327g Firmware Subscribe
Simatic Ipc377g Subscribe
Simatic Ipc377g Firmware Subscribe
Simatic Ipc427e Subscribe
Simatic Ipc427e Firmware Subscribe
Simatic Ipc477e Subscribe
Simatic Ipc477e Firmware Subscribe
Simatic Ipc627e Subscribe
Simatic Ipc627e Firmware Subscribe
Simatic Ipc647e Subscribe
Simatic Ipc647e Firmware Subscribe
Simatic Ipc677e Subscribe
Simatic Ipc677e Firmware Subscribe
Simatic Ipc847e Subscribe
Simatic Ipc847e Firmware Subscribe
Simatic Itp1000 Subscribe
Simatic Itp1000 Firmware Subscribe
Advisories
Source ID Title
EUVD EUVD EUVD-2021-20304 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.
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf cve-icon cve-icon
https://security.netapp.com/advisory/ntap-20220222-0002/ cve-icon cve-icon
https://www.insyde.com/security-pledge cve-icon cve-icon
https://www.insyde.com/security-pledge/SA-2022022 cve-icon cve-icon
https://www.kb.cert.org/vuls/id/796611 cve-icon
History

Tue, 04 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-11-04T19:12:32.043Z

Reserved: 2021-05-28T00:00:00.000Z

Link: CVE-2021-33627

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2022-02-03T02:15:06.983

Modified: 2025-11-04T20:16:00.530

Link: CVE-2021-33627

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses