What is CVE-2021-0940?

CVE-2021-0940 is a medium-severity vulnerability in Google Android, classified under Out-of-bounds Write. CVSS score: 6.7/10. Published 2021-10-25.

How severe is CVE-2021-0940?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Buffer overflow in Google Android

CVE-2021-0940

In TBD of TBD, there is a possible out of bounds write due to improper locking. This could lead to local escalation of privilege in the kernel with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-171315276References: N/A

Vulnerability class: Buffer Overflow

Published 2021-10-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.9th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Google Android
Android — versions Android kernel

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

source.android.com/security/bulletin/pixel/2021-10-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-0940?: CVE-2021-0940 is a medium-severity vulnerability in Google Android, classified under Out-of-bounds Write. CVSS score: 6.7/10. Published 2021-10-25.
How severe is CVE-2021-0940?: Medium severity. CVSS v3 base score is 6.7 out of 10.