CVE-2021-0645 Missing authorization in Android

What is CVE-2021-0645?

CVE-2021-0645 is a high-severity missing authorization vulnerability in Google Android, published on 17 Aug 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

In shouldBlockFromTree of ExternalStorageProvider.java, there is a possible permissions bypass. This could lead to local escalation of privilege, allowing an app to read private app directories in external storage, which should be restricted in Android 11, with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-157320644

Weakness: CWE-863

Which versions are affected by CVE-2021-0645?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-0645?

Apply the vendor's patch.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-0645 being exploited?

There is no known exploitation of CVE-2021-0645 in the wild and no public exploit code.

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-157320644, ASB-A-157320644, GHSA-4343-6j55-fcq3.