CVE-2021-39709: PendingIntent hijack vulnerability in SipAccountRegistry.java

platform/packages/services/Telephony Updated 02 Oct 2025

Summary

01/03/2022

Disclosed on

CVE-2021-39709

CVE

Yes i

Fix available

High

Severity

Not published

CVSS Score

CVE-2021-39709: In sendSipAccountsRemovedNotification of SipAccountRegistry.java, there is a possible permission bypass due to an unsafe PendingIntent. Affects platform/packages/services/Telephony across 2 version ranges.

>= 12:0, < 12:2022-03-01 >= 12L:0, < 12L:2022-03-01

Fixed in 12:2022-03-01. How to fix ↓

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Background

The package under scrutiny is platform/packages/services/Telephony in the Android ecosystem. This package is responsible for handling telephony services on Android devices. It includes various components and APIs for managing SIP accounts, making and receiving calls, and handling telephony-related tasks. The SipAccountRegistry.java file is a part of this package and is responsible for managing SIP accounts. It provides functions for adding, removing, and updating SIP accounts on the device.

Vulnerability Detail

The vulnerability identified as CVE-2021-39709 is a PendingIntent hijack vulnerability in the SipAccountRegistry.java file. Specifically, the issue exists in the sendSipAccountsRemovedNotification function. The vulnerability allows for a possible permission bypass due to an unsafe PendingIntent. This could potentially lead to a local escalation of privilege, where an attacker with user execution privileges could exploit the vulnerability without requiring user interaction. The impact of this vulnerability is significant as it could allow an attacker to gain elevated privileges on the affected device.

How To Fix

Minimum fixed version

12:2022-03-01

This is the first release that contains the fix.

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

In conclusion, the vulnerability CVE-2021-39709 in the SipAccountRegistry.java file of the platform/packages/services/Telephony package poses a significant risk of local privilege escalation. It is crucial to apply the provided fix from the Android Open Source Project and keep the Android operating system up to date to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for platform/packages/services/Telephony →