What is CVE-2021-39771?

CVE-2021-39771 is a high-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2022-03-30.

How severe is CVE-2021-39771?

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

Improper input validation in Google Android

CVE-2021-39771

In Settings, there is a possible way to misrepresent which app wants to add a wifi network due to improper input validation. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-12LAndroid ID: A-198661951

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

Published 2022-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (23.8th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Google Android — versions 12.1
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-2021-39771?: CVE-2021-39771 is a high-severity vulnerability in Google Android, classified under Improper Input Validation. CVSS score: 7.8/10. Published 2022-03-30.
How severe is CVE-2021-39771?: High severity. CVSS v3 base score is 7.8 out of 10.