CVE-2020-5953

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Summary

CVECVE-2020-5953
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-02-03 01:15:07 UTC
Updated2026-08-11 13:17:18 UTC
DescriptionA vulnerability exists in System Management Interrupt (SWSMI) handler of InsydeH2O UEFI Firmware code located in SWSMI handler that dereferences gRT (EFI_RUNTIME_SERVICES) pointer to call a GetVariable service, which is located outside of SMRAM. This can result in code execution in SMM (escalating privilege from ring 0 to ring -2).

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.002830000 probability, percentile 0.205410000 (date 2026-08-11)

Problem Types: NVD-CWE-noinfo | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
2.0[email protected]Primary6.9AV:L/AC:M/Au:N/C:C/I:C/A:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Medium
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:L/AC:M/Au:N/C:C/I:C/A:C

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Insyde Insydeh2o 5.12.09.0074 All All All
Application Insyde Insydeh2o 5.23.04.0045 All All All
Application Insyde Insydeh2o 5.23.45.0023 All All All
Application Insyde Insydeh2o 5.33.15.0034 All All All
Application Insyde Insydeh2o 5.34.03.0029 All All All
Application Insyde Insydeh2o 5.42.03.0010 All All All
Hardware Siemens Ruggedcom Ape1808 - All All All
Operating System Siemens Ruggedcom Ape1808 Firmware - All All All
Hardware Siemens Simatic Field Pg M5 - All All All
Operating System Siemens Simatic Field Pg M5 Firmware - All All All
Hardware Siemens Simatic Field Pg M6 - All All All
Operating System Siemens Simatic Field Pg M6 Firmware - All All All
Hardware Siemens Simatic Ipc127e - All All All
Operating System Siemens Simatic Ipc127e Firmware - All All All
Hardware Siemens Simatic Ipc227g - All All All
Operating System Siemens Simatic Ipc227g Firmware - All All All
Hardware Siemens Simatic Ipc277g - All All All
Operating System Siemens Simatic Ipc277g Firmware - All All All
Hardware Siemens Simatic Ipc327g - All All All
Operating System Siemens Simatic Ipc327g Firmware - All All All
Hardware Siemens Simatic Ipc377g - All All All
Operating System Siemens Simatic Ipc377g Firmware - All All All
Hardware Siemens Simatic Ipc427e - All All All
Operating System Siemens Simatic Ipc427e Firmware - All All All
Hardware Siemens Simatic Ipc477e - All All All
Operating System Siemens Simatic Ipc477e Firmware - All All All
Hardware Siemens Simatic Ipc477e Pro - All All All
Operating System Siemens Simatic Ipc477e Pro Firmware - All All All
Hardware Siemens Simatic Ipc627e - All All All
Operating System Siemens Simatic Ipc627e Firmware - All All All
Hardware Siemens Simatic Ipc647e - All All All
Operating System Siemens Simatic Ipc647e Firmware - All All All
Hardware Siemens Simatic Ipc677e - All All All
Operating System Siemens Simatic Ipc677e Firmware - All All All
Hardware Siemens Simatic Ipc847e - All All All
Operating System Siemens Simatic Ipc847e Firmware - All All All
Hardware Siemens Simatic Itp1000 - All All All
Operating System Siemens Simatic Itp1000 Firmware - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified
ADP Siemens SIMATIC Field PG M5 affected V22.01.10 custom Not specified
ADP Siemens SIMATIC Field PG M6 affected V26.01.13 custom Not specified
ADP Siemens SIMATIC IPC127E affected V27.01.09 custom Not specified
ADP Siemens SIMATIC IPC227G affected V28.01.04 custom Not specified
ADP Siemens SIMATIC IPC277G affected V28.01.04 custom Not specified
ADP Siemens SIMATICIPC277G PRO affected V28.01.04 custom Not specified
ADP Siemens SIMATIC IPC327G affected V28.01.04 custom Not specified
ADP Siemens SIMATIC IPC377G affected V28.01.04 custom Not specified
ADP Siemens SIMATIC IPC427E affected V21.01.17 custom Not specified
ADP Siemens SIMATIC IPC477E affected V21.01.17 custom Not specified
ADP Siemens SIMATIC IPC477E PRO affected V21.01.17 custom Not specified
ADP Siemens SIMATIC IPC627E affected V25.02.12 custom Not specified
ADP Siemens SIMATIC IPC647E affected V25.02.12 custom Not specified
ADP Siemens SIMATIC IPC677E affected V25.02.12 custom Not specified
ADP Siemens SIMATIC IPC847E affected V25.02.12 custom Not specified
ADP Siemens SIMATIC ITP1000 affected V23.01.10 custom Not specified
ADP Siemens SIPLUS IPC427E affected V21.01.17 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-306654.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
CVE-2020-5953 InsydeH20 Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
Insyde's Security Pledge | Insyde Software af854a3a-2127-422b-91ae-364da2661108 www.insyde.com Vendor Advisory
www.kb.cert.org/vuls/id/796611 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
InsydeH2O® UEFI BIOS | Insyde Software af854a3a-2127-422b-91ae-364da2661108 www.insyde.com Product, Vendor Advisory
cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 590981 Siemens Industrial Products Insyde BIOS Multiple Vulnerabilities (SSA-306654)

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