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CVE-2020-5953

Published: Feb 3, 2022Updated: Nov 4, 2025 Sources: CVE List NVDNVD-CWE-noinfo
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.3%
Top 81.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

A 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).

CVSS Vector Breakdown

AV:LAC:HPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

NVD-CWE-noinfo

Affected Products

n/an/a
insydeh2oinsyde
EmbeddedFirmware
Hardware Firmware / bios-uefi
ruggedcom ape1808 firmwaresiemensICS / OT / IoT
simatic field pg m6 firmwaresiemensICS / OT / IoT
simatic ipc127e firmwaresiemensICS / OT / IoT
insydecommercialTWHardware Firmwareaka insydeh2o
siemenscommercialDEEnterprise Softwareaka siemens ag
and 13 more affected products View all →

Exploitability

Official Patch Available

References

https://www.insyde.com/products
insyde.com
https://www.insyde.com/security-pledge
insyde.com
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf
cert-portal.siemens.com
and 2 more references View all →

Timeline

Published
Feb 3, 2022
Last Updated
Nov 4, 2025

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