Is CVE-2021-39658 actively exploited?

No active exploitation of CVE-2021-39658 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-39658 be exploited remotely?

Yes. CVE-2021-39658 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-39658?

CVE-2021-39658 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-39658

CRITICAL

CVE-2021-39658

CWE-276Published: February 11, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

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

NVD Source

Technical Analysis

CVE-2021-39658 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.