Is CVE-2021-39623 actively exploited?

No active exploitation of CVE-2021-39623 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-39623 be exploited remotely?

Yes. CVE-2021-39623 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-39623?

CVE-2021-39623 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-39623

CRITICAL

CVE-2021-39623

CWE-787Published: January 14, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

In doRead of SimpleDecodingSource.cpp, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-10 Android-11 Android-12 Android-9Android ID: A-194105348

NVD Source

Technical Analysis

CVE-2021-39623 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.