CVE-2021-38578
CRITICALCVSS 9.8/10EPSS 0.98%
Last modified
CVE-2021-38578 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.. EPSS estimates a 0.98% chance of exploitation in the next 30 days.
Description
Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Tianocore | Edk2 | <= 202202 |
| Insyde | Kernel | 5.0 |
| Insyde | Kernel | 5.1 |
| Insyde | Kernel | 5.2 |
| Insyde | Kernel | 5.3 |
| Insyde | Kernel | 5.4 |
| Insyde | Kernel | 5.5 |
References
- https://bugzilla.tianocore.org/show_bug.cgi?id=3387Issue Tracking, Vendor Advisory
- https://www.insyde.com/security-pledge/SA-2023024Third Party Advisory
- https://bugzilla.tianocore.org/show_bug.cgi?id=3387Issue Tracking, Vendor Advisory
- https://www.insyde.com/security-pledge/SA-2023024Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-38578?
Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
How severe is CVE-2021-38578?
CVE-2021-38578 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.98% probability of exploitation in the next 30 days.
How do I fix CVE-2021-38578?
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-2021-38578?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST