What is CVE-2020-5955?

CVE-2020-5955 is a critical-severity vulnerability in Insyde Insydeh2o Uefi Bios. CVSS score: 9.8/10. Published 2021-11-03.

How severe is CVE-2020-5955?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Insyde Insydeh2o Uefi Bios

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.

Published 2021-11-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

References

www.insyde.com/products (Product, Vendor Advisory)
www.insyde.com/security-pledge/SA-2021002 (Vendor Advisory)
security.netapp.com/advisory/ntap-20220223-0003/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-5955?: CVE-2020-5955 is a critical-severity vulnerability in Insyde Insydeh2o Uefi Bios. CVSS score: 9.8/10. Published 2021-11-03.
How severe is CVE-2020-5955?: Critical severity. CVSS v3 base score is 9.8 out of 10.