CVE-2021-39658 Missing authorization in Android

What is CVE-2021-39658?

CVE-2021-39658 is a critical missing authorization vulnerability in Google Android, published on 11 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

ismsEx service is a vendor service in unisoc equipment。ismsEx service is an extension of sms system service，but it does not check the permissions of the caller，resulting in permission leaks。Third-party apps can use this service to arbitrarily modify and set system properties。Product: AndroidVersions: Android SoCAndroid ID: A-207479207

Weakness: CWE-276

Which versions are affected by CVE-2021-39658?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2021-39658?

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-2021-39658 being exploited?

There is no known exploitation of CVE-2021-39658 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 1732729, A-207479207, ASB-A-207479207, GHSA-vrhh-9qjg-rj58.