Google has revealed that Android smartphones and tablets running versions of the software released before 4.3 (Jellybean) will no longer be given official updates to an important part of the software

https://www.welivesecurity.com/2015/01/12/critical-security-updates-cancelled-939-million-android-users/
https://www.welivesecurity.com/2015/01/12/critical-security-updates-cancelled-939-million-android-users/

Google has revealed that Android smartphones and tablets running versions of the software released before 4.3 (Jellybean) will no longer be given official updates to an important part of the software
Mon, 12 Jan 2015 16:53:38 +0000
Mobile Security

Source: WeLiveSecurity
Source Link: https://www.welivesecurity.com/2015/01/12/critical-security-updates-cancelled-939-million-android-users/