What is CVE-2021-0639?

CVE-2021-0639 is a medium-severity vulnerability in Google Android, classified under CWE-922. CVSS score: 5.5/10. Published 2021-08-17.

How severe is CVE-2021-0639?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2021-0639 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Google Android

CVE-2021-0639

In multiple functions of libl3oemcrypto.cpp, there is a possible weakness in the existing obfuscation mechanism due to the way sensitive data is handled. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android SoCAndroid ID: A-190724551

Published 2021-08-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (1.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.6% 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)

CWE-922

Public proof-of-concept exploits

References

source.android.com/security/bulletin/2021-08-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-0639?: CVE-2021-0639 is a medium-severity vulnerability in Google Android, classified under CWE-922. CVSS score: 5.5/10. Published 2021-08-17.
How severe is CVE-2021-0639?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2021-0639 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.