CVE-2021-0343 Memory corruption in Android

What is CVE-2021-0343?

CVE-2021-0343 is a medium-severity memory corruption vulnerability in Google Android, published on 4 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In kisd, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Product: Android; Versions: Android-11; Patch ID: ALPS05449962.

Weakness: CWE-787

Which versions are affected by CVE-2021-0343?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-0343?

No fix has been published for CVE-2021-0343 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-0343 being exploited?

There is no known exploitation of CVE-2021-0343 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-g437-q829-mh8h.