CVE-2021-39659 Denial of service in Android

What is CVE-2021-39659?

CVE-2021-39659 is a medium-severity denial of service vulnerability in Google Android, published on 14 Jan 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In sortSimPhoneAccountsForEmergency of CreateConnectionProcessor.java, there is a possible prevention of access to emergency calling due to an unhandled exception. In rare instances, this could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-10 Android-11 Android-12Android ID: A-208267659

Weakness: CWE-755

Which versions are affected by CVE-2021-39659?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-39659?

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-2021-39659 being exploited?

There is no known exploitation of CVE-2021-39659 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-208267659, ASB-A-208267659, GHSA-38mp-p2g2-47gf.