CVE-2021-38576

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected software

Vendor	Product	Versions
n/a	EDK II	edk2-stable202105, edk2-stable202102, edk2-stable202011, edk2-stable202008, edk2-stable202005, edk2-stable202002, edk2-stable201911, edk2-stable201908, edk2-stable201905, edk2-stable201903, edk2-stable201811, edk2-stable201808

References

https://bugzilla.tianocore.org/show_bug.cgi?id=3499Issue Tracking, Permissions Required, Third Party Advisory
https://bugzilla.tianocore.org/show_bug.cgi?id=3499Issue Tracking, Permissions Required, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/06/msg00007.html

Timeline

Published: Jan 3, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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