What is CVE-2021-39806?

CVE-2021-39806 is a high-severity vulnerability in Google Android, classified under Double Free. CVSS score: 7.8/10. Published 2022-06-15.

How severe is CVE-2021-39806?

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

Double Free in Google Android

CVE-2021-39806

In closef of label_backends_android.c, there is a possible way to corrupt memory due to a double free. This could lead to local escalation of privilege during startup of servicemanager, if an attacker can trigger an initialization failure, with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12LAndroid ID: A-215387420

Vulnerability class: Double Free

Published 2022-06-15 · 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 (1.0th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.0% 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 — versions 12.1
Android — versions Android-12L

Weakness classification (CWE)

CWE-415 — Double Free

References

source.android.com/security/bulletin/pixel/2022-06-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39806?: CVE-2021-39806 is a high-severity vulnerability in Google Android, classified under Double Free. CVSS score: 7.8/10. Published 2022-06-15.
How severe is CVE-2021-39806?: High severity. CVSS v3 base score is 7.8 out of 10.