CVE-2021-39794 Missing authorization in Android

What is CVE-2021-39794?

CVE-2021-39794 is a high-severity missing authorization vulnerability in Google Android, published on 12 Apr 2022. 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 broadcastPortInfo of AdbService.java, there is a possible way for apps to run code as the shell user, if wireless debugging is enabled, due to a missing permission check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-11 Android-12 Android-12LAndroid ID: A-205836329

Weakness: CWE-276

Which versions are affected by CVE-2021-39794?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-39794?

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-2021-39794 being exploited?

There is no known exploitation of CVE-2021-39794 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-205836329, ASB-A-205836329, GHSA-qq26-67cv-q98h.