CVE-2021-0334 Security feature bypass in Android

What is CVE-2021-0334?

CVE-2021-0334 is a high-severity vulnerability in Google Android, published on 10 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In onTargetSelected of ResolverActivity.java, there is a possible settings bypass allowing an app to become the default handler for arbitrary domains. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-8.1 Android-9 Android-10 Android-11Android ID: A-163358811

Weakness: CWE-732

Which versions are affected by CVE-2021-0334?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-0334?

Apply the vendor's patch.

Is CVE-2021-0334 being exploited?

There is no known exploitation of CVE-2021-0334 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Google Android

• CVE-2026-58704 Google Pixel Improper Authorization Exploited High 8.8
• CVE-2025-48543 Android Runtime Use-After-Free Exploited High 8.8
• CVE-2023-35674 Android Framework Privilege Escalation Exploited High 8.8
• CVE-2025-48595 Android Framework Integer Overflow Exploited High 8.4
• CVE-2024-32896 Android Pixel Privilege Escalation Exploited High 8.1

All Google Android vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as A-163358811, ASB-A-163358811, GHSA-w9rg-m5v9-r8xf.