What is CVE-2023-21120?

CVE-2023-21120 is a high-severity vulnerability in Google Android, classified under Use After Free. CVSS score: 7.8/10. Published 2023-06-15.

How severe is CVE-2023-21120?

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

Use After Free in Google Android

CVE-2023-21120

In multiple functions of cdm_engine.cpp, there is a possible use-after-free due to improper locking. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android SoCAndroid ID: A-258188673

Vulnerability class: Use-After-Free

Published 2023-06-15 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.001 (0.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 0th percentile — 0.0% 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 SoC

Weakness classification (CWE)

References

source.android.com/security/bulletin/2023-06-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-21120?: CVE-2023-21120 is a high-severity vulnerability in Google Android, classified under Use After Free. CVSS score: 7.8/10. Published 2023-06-15.
How severe is CVE-2023-21120?: High severity. CVSS v3 base score is 7.8 out of 10.