CVE-2021-0428 Missing authorization in Android

What is CVE-2021-0428?

CVE-2021-0428 is a medium-severity missing authorization vulnerability in Google Android, published on 13 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In getSimSerialNumber of TelephonyManager.java, there is a possible way to read a trackable identifier due to a missing permission check. This could lead to local information disclosure with User execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-10Android ID: A-173421434

Weakness: CWE-862

Which versions are affected by CVE-2021-0428?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-0428?

Apply the vendor's patch.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-0428 being exploited?

There is no known exploitation of CVE-2021-0428 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-173421434, ASB-A-173421434, GHSA-5p76-82qh-5gp5.