CVE-2020-27339 - Vulnerability Details - OpenCVE

In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5).

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

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 0.00056.

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:o:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 2 [-]

cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 3 [-]

cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 4 [-]

cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 5 [-]

cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 6 [-]

cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 7 [-]

cpe:2.3:o:insyde:insydeh2o:*:*:*:*:*:*:*:*

Configuration 8 [-]

AND

cpe:2.3:o:siemens:ruggedcom_apr1808_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:ruggedcom_apr1808:-:*:*:*:*:*:*:*

Configuration 9 [-]

AND

cpe:2.3:o:siemens:simatic_field_pg_m5_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_field_pg_m5:-:*:*:*:*:*:*:*

Configuration 10 [-]

AND

cpe:2.3:o:siemens:simatic_field_pg_m6_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_field_pg_m6:-:*:*:*:*:*:*:*

Configuration 11 [-]

AND

cpe:2.3:o:siemens:simatic_ipc127e_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc127e:-:*:*:*:*:*:*:*

Configuration 12 [-]

AND

cpe:2.3:o:siemens:simatic_ipc227g_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc227g:-:*:*:*:*:*:*:*

Configuration 13 [-]

AND

cpe:2.3:o:siemens:simatic_ipc277g_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc277g:-:*:*:*:*:*:*:*

Configuration 14 [-]

AND

cpe:2.3:o:siemens:simatic_ipc327g_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc327g:-:*:*:*:*:*:*:*

Configuration 15 [-]

AND

cpe:2.3:o:siemens:simatic_ipc377g_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc377g:-:*:*:*:*:*:*:*

Configuration 16 [-]

AND

cpe:2.3:o:siemens:simatic_ipc427e_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc427e:-:*:*:*:*:*:*:*

Configuration 17 [-]

AND

cpe:2.3:o:siemens:simatic_ipc477e_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc477e:-:*:*:*:*:*:*:*

Configuration 18 [-]

AND

cpe:2.3:o:siemens:simatic_ipc477e_pro_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc477e_pro:-:*:*:*:*:*:*:*

Configuration 19 [-]

AND

cpe:2.3:o:siemens:simatic_ipc627e_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc627e:-:*:*:*:*:*:*:*

Configuration 20 [-]

AND

cpe:2.3:o:siemens:simatic_ipc647e_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc647e:-:*:*:*:*:*:*:*

Configuration 21 [-]

AND

cpe:2.3:o:siemens:simatic_ipc677e_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc677e:-:*:*:*:*:*:*:*

Configuration 22 [-]

AND

cpe:2.3:o:siemens:simatic_ipc847e_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_ipc847e:-:*:*:*:*:*:*:*

Configuration 23 [-]

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	Ruggedcom Apr1808 Subscribe Ruggedcom Apr1808 Firmware 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 Ipc477e Pro Subscribe Simatic Ipc477e Pro 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-2020-19852	In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5).

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
https://security.netapp.com/advisory/ntap-20220216-0005/
https://www.insyde.com/security-pledge/SA-2021001
https://www.kb.cert.org/vuls/id/796611

History

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

Type	Values Removed	Values Added
References		https://www.kb.cert.org/vuls/id/796611

Projects

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MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-06-16T15:49:34.000Z

Updated: 2025-11-04T19:12:22.115Z

Reserved: 2020-10-20T00:00:00.000Z

Link: CVE-2020-27339

Vulnrichment

No data.

NVD

Status : Modified

Published: 2021-06-16T16:15:07.897

Modified: 2025-11-04T20:15:58.603

Link: CVE-2020-27339

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-20

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false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5)."}, {"lang": "es", "value": "En el kernel de Insyde InsydeH2O 5.x, algunos controladores SMM no validaban correctamente los par\u00e1metros CommBuffer y CommBufferSize, lo que permit\u00eda a los llamantes corromper el firmware o la memoria del sistema operativo. Las versiones corregidas para este problema en los controladores AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe y SdMcDeviceDxe son 05.16.25, 05.26.25, 05.35.25, 05.43.25 y 05.51.25 (para los n\u00facleos 5.1 a 5.5)"}], "id": "CVE-2020-27339", "lastModified": "2025-11-04T20:15:58.603", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.2, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-06-16T16:15:07.897", "references": [{"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220216-0005/"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://www.insyde.com/security-pledge/SA-2021001"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20220216-0005/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.insyde.com/security-pledge/SA-2021001"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.kb.cert.org/vuls/id/796611"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "nvd@nist.gov", "type": "Primary"}]}