Vulnerability in Tianocore Edk Ii

CVE-2021-38578

Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.

EPSS: 0.001 (20.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L.

Affected products

Tianocore Edk Ii — versions edk2-stable202208

Weakness classification (CWE)

CWE-124 — Buffer Underwrite

Public proof-of-concept exploits

w4zu/Debian_

References

bugzilla.tianocore.org/show_bug.cgi (x_refsource_MISC)
www.insyde.com/security-pledge/SA-2023024

Frequently asked questions

What is CVE-2021-38578?: CVE-2021-38578 is a high-severity vulnerability in Tianocore Edk Ii, classified under Buffer Underwrite. CVSS score: 7.4/10. Published 2022-03-03.
How severe is CVE-2021-38578?: High severity. CVSS v3 base score is 7.4 out of 10.
Is CVE-2021-38578 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.