What is CVE-2021-0403?

CVE-2021-0403 is a medium-severity vulnerability in Google Android, classified under Missing Authorization. CVSS score: 4.4/10. Published 2021-02-26.

How severe is CVE-2021-0403?

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

Auth bypass in Google Android

CVE-2021-0403

In netdiag, there is a possible information disclosure due to a missing permission check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation. Product: Android; Versions: Android-11; Patch ID: ALPS05475124.

Vulnerability class: Broken Access Control

Published 2021-02-26 · 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 (2.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.1% 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 11.0
Android — versions Android-11

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

corp.mediatek.com/product-security-acknowledgements (Third Party Advisory)

Frequently asked questions

What is CVE-2021-0403?: CVE-2021-0403 is a medium-severity vulnerability in Google Android, classified under Missing Authorization. CVSS score: 4.4/10. Published 2021-02-26.
How severe is CVE-2021-0403?: Medium severity. CVSS v3 base score is 4.4 out of 10.