CVE-2023-21186 Denial of service in Android

What is CVE-2023-21186?

CVE-2023-21186 is a high-severity denial of service vulnerability in Google Android, published on 28 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In LogResponse of Dns.cpp, there is a possible out of bounds read due to a missing bounds check. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-261079188

Weakness: CWE-125

Which versions are affected by CVE-2023-21186?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2023-21186?

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-2023-21186 being exploited?

There is no known exploitation of CVE-2023-21186 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-261079188, GHSA-c65x-4363-qmmx, PUB-A-261079188.