What is CVE-2021-39993?

CVE-2021-39993 is a critical-severity vulnerability in Huawei Emui, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2022-01-10.

How severe is CVE-2021-39993?

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

Integer overflow in Huawei Emui

CVE-2021-39993

There is an Integer overflow vulnerability with ACPU in smartphones. Successful exploitation of this vulnerability may cause out-of-bounds access.

Vulnerability class: Integer Overflow

Published 2022-01-10 · 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: 0.008 (53.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.4% 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 11.0.0
Huawei Magic Ui — versions 4.0.0
Emui;magic Ui — versions EMUI 11.0.0, Magic UI 4.0.0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

consumer.huawei.com/en/support/bulletin/2021/12/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39993?: CVE-2021-39993 is a critical-severity vulnerability in Huawei Emui, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2022-01-10.
How severe is CVE-2021-39993?: Critical severity. CVSS v3 base score is 9.8 out of 10.