VulnerabilityModified
CVE-2021-38576
A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty.
HIGH 7.5EPSS 1.17%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.17% probability · 66th percentile
- CISA KEV
- Not listed
- Affected
- tianocore/edk2
- Source
- infosec@edk2.groups.io
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.