What is CVE-2021-39647?

CVE-2021-39647 is a medium-severity vulnerability in Google Android, classified under Improper Locking. CVSS score: 4.4/10. Published 2021-12-15.

How severe is CVE-2021-39647?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Google Android

CVE-2021-39647

In mon_smc_load_sp of gs101-sc/plat/samsung/exynos/soc/exynos9845/smc_booting.S, there is a possible reinitialization of TEE due to improper locking. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-198713939References: N/A

Published 2021-12-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (0.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.6% 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 kernel

Weakness classification (CWE)

CWE-667 — Improper Locking

References

source.android.com/security/bulletin/pixel/2021-12-01 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-39647?: CVE-2021-39647 is a medium-severity vulnerability in Google Android, classified under Improper Locking. CVSS score: 4.4/10. Published 2021-12-15.
How severe is CVE-2021-39647?: Medium severity. CVSS v3 base score is 4.4 out of 10.