CVE-2021-4206 is a vulnerability that affects the Google Android operating system. This vulnerability allows an attacker to execute arbitrary code remotely without requiring any user interaction. Essentially, this means that an attacker can take control of a device running an affected version of the Android operating system, and perform actions such as installing malicious apps, stealing data, or even turning on the microphone and camera to record conversations.
The vulnerability was discovered by security researchers at Trend Micro in February 2021. Google released a patch for the vulnerability as part of their July 2021 security update, which was made available to Pixel devices on July 5th. However, given the fragmented nature of the Android ecosystem, it is up to individual device manufacturers and carriers to distribute these updates to their customers - meaning that many users may still be vulnerable to the attack.
It is important for Android users to ensure that their devices are updated to the latest security patch level, and to be cautious when downloading and installing apps from unknown sources. Additionally, users should consider using security software that can detect and block malicious activity on their devices.