What is CVE-2021-40000?

CVE-2021-40000 is a high-severity vulnerability in Huawei Harmonyos, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2022-01-10.

How severe is CVE-2021-40000?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Huawei Harmonyos

CVE-2021-40000

The Bluetooth module has an out-of-bounds write vulnerability. Successful exploitation of this vulnerability may result in malicious command execution at the remote end.

Vulnerability class: Buffer Overflow

Published 2022-01-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (29.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Huawei Harmonyos — versions 2.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

device.harmonyos.com/en/docs/security/update/security-bulletins-202112-00000011… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-40000?: CVE-2021-40000 is a high-severity vulnerability in Huawei Harmonyos, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2022-01-10.
How severe is CVE-2021-40000?: High severity. CVSS v3 base score is 8.8 out of 10.