Group FaceTime remains permanently disabled in the earlier versions of iOS that could run it, back to iOS 12.1, though the Group FaceTime servers have been re-enabled.
The bug enabled interlopers to turn an iPhone into a live microphone while using Group FaceTime.
A FaceTime security update is available for the Mac version of the video messaging app as well.
While they were at it, Apple also slipped in two other security updates in the iOS and macOS releases for vulnerabilities they found Foundation and IOKit that could lead to code execution or privilege escalation. Cupertino blames the problem on "a logic issue.in the handling of Group FaceTime calls". Alongside the latest iOS update, the Cupertino company has also restored the Group FaceTime server. The size of that gift is being speculated about and reckoned to be pretty high, given the fact that Apple offers up to $200,000 as part of its bug bounty program.
The changelog for iOS 12.1.4, which does patch the issue, does not suggest when Apple will reenable the feature. However, the ability to add new participants to a FaceTime call by swiping up the screen wasn't available at the time of filing this story.
In a security note on Apple's website, the company acknowledges that a glitch meant "the initiator of a Group FaceTime call may be able to cause the recipient to answer".
The update is about 335MB is size and you'll have to connect to a WiFi connection to download.
From this menu tap Software Update and check if any updates are ready for your device.