What is CVE-2021-37021?

CVE-2021-37021 is a critical-severity vulnerability in Huawei Emui, classified under Out-of-bounds Write. CVSS score: 9.1/10. Published 2021-12-07.

How severe is CVE-2021-37021?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Buffer overflow in Huawei Emui

CVE-2021-37021

There is a Stack-based Buffer Overflow vulnerability in Huawei Smartphone.Successful exploitation of this vulnerability may lead to Out-of-bounds read.

Vulnerability class: Buffer Overflow

Published 2021-12-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Huawei Emui — versions 10.1.0, 10.1.1, 11.0.0
Huawei Harmonyos — versions 2.0
Huawei Magic Ui — versions 3.1.0, 3.1.1, 4.0.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

device.harmonyos.com/en/docs/security/update/security-bulletins-202109-00000011… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-37021?: CVE-2021-37021 is a critical-severity vulnerability in Huawei Emui, classified under Out-of-bounds Write. CVSS score: 9.1/10. Published 2021-12-07.
How severe is CVE-2021-37021?: Critical severity. CVSS v3 base score is 9.1 out of 10.