What is CVE-2021-39778?

CVE-2021-39778 is a medium-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 5.5/10. Published 2022-03-30.

How severe is CVE-2021-39778?

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

Improper input validation in Google Android

CVE-2021-39778

In Telecomm, there is a possible way to determine whether an app is installed, without query permissions, due to improper input validation. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12LAndroid ID: A-196406138

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-03-30 · 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 (1.3th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.3% 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 12.0
Android — versions Android-12L

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

source.android.com/security/bulletin/android-12l (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39778?: CVE-2021-39778 is a medium-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 5.5/10. Published 2022-03-30.
How severe is CVE-2021-39778?: Medium severity. CVSS v3 base score is 5.5 out of 10.