CVE-2021-38576
HIGHCVSS 7.5/10EPSS 1.18%
Last modified
CVE-2021-38576 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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 estimates a 1.18% chance of exploitation in the next 30 days.
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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Tianocore | Edk2 | 201808 |
| Tianocore | Edk2 | 201811 |
| Tianocore | Edk2 | 201903 |
| Tianocore | Edk2 | 201905 |
| Tianocore | Edk2 | 201908 |
| Tianocore | Edk2 | 201911 |
| Tianocore | Edk2 | 202002 |
| Tianocore | Edk2 | 202005 |
| Tianocore | Edk2 | 202008 |
| Tianocore | Edk2 | 202011 |
| Tianocore | Edk2 | 202102 |
| Tianocore | Edk2 | 202105 |
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
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-38576?
CVE-2021-38576 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.
How do I fix CVE-2021-38576?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-38576?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST