CVE-2023-21391 Denial of service in Android

What is CVE-2023-21391?

CVE-2023-21391 is a high-severity denial of service vulnerability in Google Android, published on 30 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Messaging, there is a possible way to disable the messaging application due to improper input validation. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation.

Weakness: CWE-20

Which versions are affected by CVE-2023-21391?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2023-21391?

No fix has been published for CVE-2023-21391 yet. Limit exposure of the affected software until one is available.

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-2023-21391 being exploited?

There is no known exploitation of CVE-2023-21391 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 GHSA-vfrv-h9hq-28mp.