What is CVE-2021-38575?

CVE-2021-38575 is a high-severity vulnerability in Insyde Kernel, classified under Buffer Underwrite. CVSS score: 8.1/10. Published 2021-12-01.

How severe is CVE-2021-38575?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2021-38575 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Insyde Kernel

CVE-2021-38575

NetworkPkg/IScsiDxe has remotely exploitable buffer overflows.

Published 2021-12-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.4th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.020 · change: +0.001

Affected products

Insyde Kernel — versions 5.0, 5.1, 5.2
Tianocore Edk2
Tianocore Edk Ii — versions unspecified

Weakness classification (CWE)

Public proof-of-concept exploits

w4zu/Debian_

References

bugzilla.tianocore.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
www.insyde.com/security-pledge/SA-2023025 (Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2021-38575?: CVE-2021-38575 is a high-severity vulnerability in Insyde Kernel, classified under Buffer Underwrite. CVSS score: 8.1/10. Published 2021-12-01.
How severe is CVE-2021-38575?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2021-38575 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.