What is CVE-2021-36999?

CVE-2021-36999 is a high-severity vulnerability in Huawei Emui, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-10-28.

How severe is CVE-2021-36999?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Huawei Emui

CVE-2021-36999

There is a Buffer overflow vulnerability in Huawei Smartphone.Successful exploitation of this vulnerability by sending malicious images and inducing users to open the images may cause remote code execution.

Vulnerability class: Buffer Overflow

Published 2021-10-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Huawei Emui — versions 11.0.0, 10.1.1
Huawei Magic Ui — versions 4.0.0, 3.1.1
Huawei Magic Ui — versions 3.1.1, 4.0.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

consumer.huawei.com/en/support/bulletin/2021/7/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-36999?: CVE-2021-36999 is a high-severity vulnerability in Huawei Emui, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-10-28.
How severe is CVE-2021-36999?: High severity. CVSS v3 base score is 7.8 out of 10.