CVE-2021-39670 Denial of service in Android

What is CVE-2021-39670?

CVE-2021-39670 is a medium-severity denial of service vulnerability in Google Android, published on 10 May 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In setStream of WallpaperManager.java, there is a possible way to cause a permanent DoS due to improper input validation. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12 Android-12LAndroid ID: A-204087139

Weakness: CWE-770

Which versions are affected by CVE-2021-39670?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-39670?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-39670 being exploited?

There is no known exploitation of CVE-2021-39670 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-204087139, ASB-A-204087139, GHSA-jmqc-pfj3-c33g.