What is CVE-2023-21356?

CVE-2023-21356 is a high-severity vulnerability in Google Android, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2023-10-30.

How severe is CVE-2023-21356?

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

Buffer overflow in Google Android

CVE-2023-21356

In Bluetooth, there is a possible out of bounds write due to a missing bounds check. This could lead to remote (proximal/adjacent) code execution with no additional execution privileges needed. User interaction is not needed for exploitation.

Vulnerability class: Buffer Overflow

Published 2023-10-30 · 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: 0.001 (3.2th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.2% 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 — versions 14.0, 14

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

source.android.com/docs/security/bulletin/android-14 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-21356?: CVE-2023-21356 is a high-severity vulnerability in Google Android, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2023-10-30.
How severe is CVE-2023-21356?: High severity. CVSS v3 base score is 8.8 out of 10.