What is CVE-2021-40017?

CVE-2021-40017 is a critical-severity vulnerability in Huawei Emui, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2022-09-16.

How severe is CVE-2021-40017?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Improper input validation in Huawei Emui

CVE-2021-40017

The HW_KEYMASTER module lacks the validity check of the key format. Successful exploitation of this vulnerability may result in out-of-bounds memory access.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-09-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.001

Affected products

Huawei Emui — versions 11.0.1, 12.0.0
Huawei Harmonyos — versions 2.0
Harmonyos;emui — versions HarmonyOS 2.0, EMUI 12.0.0,EMUI 11.0.1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

device.harmonyos.com/en/docs/security/update/security-bulletins-phones-202209-0… (Vendor Advisory)
consumer.huawei.com/en/support/bulletin/2022/10/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-40017?: CVE-2021-40017 is a critical-severity vulnerability in Huawei Emui, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2022-09-16.
How severe is CVE-2021-40017?: Critical severity. CVSS v3 base score is 9.8 out of 10.