CVE-2021-0313 Denial of service in Android

What is CVE-2021-0313?

CVE-2021-0313 is a high-severity denial of service vulnerability in Google Android, published on 11 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In isWordBreakAfter of LayoutUtils.cpp, there is a possible way to slow or crash a TextView 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. Product: Android; Versions: Android-9, Android-10, Android-11, Android-8.0, Android-8.1; Android ID: A-170968514.

Weakness: CWE-20

Which versions are affected by CVE-2021-0313?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-0313?

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-2021-0313 being exploited?

There is no known exploitation of CVE-2021-0313 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-170968514, ASB-A-170968514, GHSA-jrrf-28xq-3v3x.