CVE-2021-0393 Integer overflow in Android

What is CVE-2021-0393?

CVE-2021-0393 is a high-severity vulnerability in Google Android, published on 10 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

In Scanner::LiteralBuffer::NewCapacity of scanner.cc, there is a possible out of bounds write due to an integer overflow. This could lead to remote code execution if an attacker can supply a malicious PAC file, with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11 Android-8.1 Android-9 Android-10Android ID: A-168041375

Weakness: CWE-787, CWE-190

Which versions are affected by CVE-2021-0393?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-0393?

Apply the vendor's patch.

Is CVE-2021-0393 being exploited?

There is no known exploitation of CVE-2021-0393 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-168041375, ASB-A-168041375, GHSA-g979-fm26-v69p.