What is CVE-2021-39635?

CVE-2021-39635 is a critical-severity vulnerability in Google Android, classified under Incorrect Default Permissions. CVSS score: 9.1/10. Published 2022-02-11.

How severe is CVE-2021-39635?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2021-39635 known to be exploited?

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

Vulnerability in Google Android

CVE-2021-39635

ims_ex is a vendor system service used to manage VoLTE in unisoc devices，But it does not verify the caller's permissions，so that normal apps (No phone permissions) can obtain some VoLTE sensitive information and manage VoLTE calls.Product: AndroidVersions: Android SoCAndroid ID: A-206492634

Published 2022-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (40.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Google Android
Android — versions Android SoC

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

Public proof-of-concept exploits

References

source.android.com/security/bulletin/2022-02-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39635?: CVE-2021-39635 is a critical-severity vulnerability in Google Android, classified under Incorrect Default Permissions. CVSS score: 9.1/10. Published 2022-02-11.
How severe is CVE-2021-39635?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2021-39635 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.