CVE-2020-5955

Name: CVE-2020-5955
Creator: NVD / NIST
Published: 2021-11-03T01:15:06.93+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.37%

Last modified Jun 17, 2026

CVE-2020-5955 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Int15MicrocodeSmm in Insyde InsydeH2O before 2021-10-14 on Intel client chipsets. A caller may be able to escalate privileges.. EPSS estimates a 1.37% chance of exploitation in the next 30 days.

Description

An issue was discovered in Int15MicrocodeSmm in Insyde InsydeH2O before 2021-10-14 on Intel client chipsets. A caller may be able to escalate privileges.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.37%

68.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Insyde	Insydeh2o Uefi Bios	< 05.32.30.0001
Insyde	Insydeh2o Uefi Bios	< 05.41.35.0001
Insyde	Insydeh2o Uefi Bios	< 05.42.11.0026
Insyde	Insydeh2o Uefi Bios	< 05.04.21.0068
Insyde	Insydeh2o Uefi Bios	< 05.42.09.0003
Insyde	Insydeh2o Uefi Bios	< 05.21.51.0040
Insyde	Insydeh2o Uefi Bios	< 05.34.09.0030
Insyde	Insydeh2o Uefi Bios	< 05.32.47.0001
Insyde	Insydeh2o Uefi Bios	< 05.23.45.0023
Insyde	Insydeh2o Uefi Bios	< 05.21.43.0001
Insyde	Insydeh2o Uefi Bios	< 05.23.04.0045
Insyde	Insydeh2o Uefi Bios	< 05.11.26.0015
Insyde	Insydeh2o Uefi Bios	< 05.12.09.0075
Insyde	Insydeh2o Uefi Bios	< 05.10.48.0001
Insyde	Insydeh2o Uefi Bios	< 05.05.39.0001
Insyde	Insydeh2o Uefi Bios	< 05.04.15.0001
Insyde	Insydeh2o Uefi Bios	< 05.23.27.0001

References

https://security.netapp.com/advisory/ntap-20220223-0003/Third Party Advisory
https://www.insyde.com/productsProduct, Vendor Advisory
https://www.insyde.com/security-pledge/SA-2021002Vendor Advisory
https://security.netapp.com/advisory/ntap-20220223-0003/Third Party Advisory
https://www.insyde.com/productsProduct, Vendor Advisory
https://www.insyde.com/security-pledge/SA-2021002Vendor Advisory

Timeline

Published: Nov 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5955?

An issue was discovered in Int15MicrocodeSmm in Insyde InsydeH2O before 2021-10-14 on Intel client chipsets. A caller may be able to escalate privileges.

How severe is CVE-2020-5955?

CVE-2020-5955 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.37% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5955?

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-2020-5955?

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

Scan your code now

Source: NVD / NIST