A part of the Android operating system is affected by a vulnerability, which can affect nearly a billion devices.
Android WebView provides Android users the ability to view things from the Internet in apps, so you do not need to open a browser, but a mistake therein makes Android vulnerable. It affects all versions of Android before Android 4.4 KitKat.
It runs in all up in approximately 938 million units, that are susceptible to this vulnerability, as Google does not want to do something about. Americans are stopped making patches to Android versions before Android 4.4 KitKat.
That a company does not want to update systems, there are several versions behind is not strange, but it is, after all, many users whose devices are potentially at risk.
The error is considered to be very serious, since it is a part of the system that reaches out and can affect many parts. There isn’t a specific way to exploit this flaw, an attacker would find their way into but this loophole, it can provide access to the Android system via the Web.
In Android 4.4 KitKat switched Google the vulnerable system out with a similar, which is not exposed to this bug. That is why devices on Android 4.4 KitKat and 5.0 Lollipop is not at risk for this reason.
Safety is one of the reasons why Google and many other companies always recommends to update their devices to the latest version.