What is CVE-2021-38576?

CVE-2021-38576 is a high-severity vulnerability in Tianocore Edk2. CVSS score: 7.5/10. Published 2022-01-03.

How severe is CVE-2021-38576?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-38576 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Tianocore Edk2

CVE-2021-38576

A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty. This can be used to permanently brick the TPM in multiple ways, as well as to non-permanently DoS the system.

EPSS: 0.012 (63.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Tianocore Edk2 — versions 201808, 201811, 201903
N/a Edk Ii — versions edk2-stable202105, edk2-stable202102, edk2-stable202011, edk2-stable202008, edk2-stable202005, edk2-stable202002, edk2-stable201911, edk2-stable201908, edk2-stable201905, edk2-stable201903, edk2-stable201811, edk2-stable201808

Public proof-of-concept exploits

w4zu/Debian_

References

infosec@edk2.groups.io (Permissions Required, Third Party Advisory, x_refsource_MISC, Issue Tracking)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2021-38576?: CVE-2021-38576 is a high-severity vulnerability in Tianocore Edk2. CVSS score: 7.5/10. Published 2022-01-03.
How severe is CVE-2021-38576?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-38576 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.