The official version of iOS 12.1.4 is a minor version update, the most important security update.
The official version of iOS 12.1.4 was released about half a month after the previous official version of iOS 12.1.3. When upgrading through OTA, the update package size from the last official version to iOS 12.1.4 is about 100MB (there are slight differences among different models). It mainly fixes bugs, and the most important update is security update.
According to the update log of the iOS 12.1.4 version system, this version of the system provides important security updates, and Apple officially recommends that all users install it. Of course, simply looking at this log description, some iPhone users may not understand. Specifically, this update fixes a security vulnerability in the FaceTime group chat function.
It is understood that there are security vulnerabilities in the FaceTime group chat function from iOS 12.1 to iOS 12.1.3. Therefore, after the iOS 12.1.4 version is pushed, Apple recommends that all iPhone users upgrade.
In addition to this bug, there is also a serious security vulnerability when recording live photos during FaceTime video chats. Apple did not explain the specifics of this vulnerability, but Apple said that iOS 12.1.4 has already fixed it. This loophole.