Is CVE-2021-38576 in the CISA KEV catalog?

No. CVE-2021-38576 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-38576?

CVE-2021-38576 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-38576?

CVE-2021-38576 has an EPSS score of 1.17% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-38576?

Upgrade edk2 on debian 11 to 2020.11-2+deb11u3 or later.

CVE & CISA-KEV Catalog

CVE-2021-38576

HIGH

7.5

CVSS v3

NVD

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.

How to fix

Remediation Available

edk2Debian

Fixed in:2020.11-2+deb11u3CVE-2021-38576

Fixed in:2021.11-1CVE-2021-38576

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.17%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Third-Party Advisory1

bugzilla.tianocore.org

Other references1

lists.debian.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.