CVE-2020-5953

Name: CVE-2020-5953
Creator: NVD / NIST
Published: 2022-02-03T01:15:07.647+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2020-5953 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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).. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.28%

19.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Insyde	Insydeh2o	5.12.09.0074
Insyde	Insydeh2o	5.23.04.0045
Insyde	Insydeh2o	5.23.45.0023
Insyde	Insydeh2o	5.33.15.0034
Insyde	Insydeh2o	5.34.03.0029
Insyde	Insydeh2o	5.42.03.0010
Siemens	Ruggedcom Ape1808 Firmware	All versions
Siemens	Simatic Field Pg M6 Firmware	All versions
Siemens	Simatic Ipc127e Firmware	All versions
Siemens	Simatic Ipc227g Firmware	All versions
Siemens	Simatic Ipc277g Firmware	All versions
Siemens	Simatic Itp1000 Firmware	All versions
Siemens	Simatic Ipc477e Pro Firmware	All versions
Siemens	Simatic Ipc627e Firmware	All versions
Siemens	Simatic Ipc647e Firmware	All versions
Siemens	Simatic Ipc677e Firmware	All versions
Siemens	Simatic Ipc847e Firmware	All versions
Siemens	Simatic Ipc327g Firmware	All versions
Siemens	Simatic Ipc377g Firmware	All versions
Siemens	Simatic Ipc427e Firmware	All versions
Siemens	Simatic Ipc477e Firmware	All versions
Siemens	Simatic Field Pg M5 Firmware	All versions

References

https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
https://security.netapp.com/advisory/ntap-20220222-0005/Third Party Advisory
https://www.insyde.com/productsProduct, Vendor Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdfThird Party Advisory
https://security.netapp.com/advisory/ntap-20220222-0005/Third Party Advisory
https://www.insyde.com/productsProduct, Vendor Advisory
https://www.insyde.com/security-pledgeVendor Advisory
https://www.kb.cert.org/vuls/id/796611

Timeline

Published: Feb 3, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5953?

How severe is CVE-2020-5953?

CVE-2020-5953 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5953?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-5953?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST