In a statement, Apple apologised for the bug, which is believed to have been flagged to the company through its own security issue reporting website.
The Walkie-Talkie app was introduced with the roll out of WatchOS 5 last September and allowed FaceTime Audio calls to be carried out in a similar way to talking on a walkie-talkie.
If you have an Apple Watch, you'll find the app will remain on your device but it won't work until the fix has been issued.More news: CDC: Pet supply retailer recalling pig ears due to salmonella outbreak
It's unclear how the app can be abused to spy on someone's iPhone, but Apple says there's no evidence it was exploited in the wild. Allowing people to listen in before a call was accepted.
At the end of the day, although iPhone and Apple Watch users have every reason to be annoyed by these discoveries and the temporary deactivation of the Walkie-Talkie app, the important thing to remember is this particular vulnerability was never exploited (at least to Apple's current knowledge) and the functionality will be restored "as soon as possible".
In a statement to TechCrunch, Apple stated that they were recently made aware of the vulnerability and disabled that functionality as quickly as they could, while they worked on a fix.More news: Couple claims clinic implanted their embryo in wrong woman
Apple has had to shut down its Apple Watch Walkie Talkie app while it patches up a bug that could enable someone to eavesdrop on users via their iPhones.
The gaffe comes just months after Apple was forced to disable a FaceTime calling feature due to a major privacy flaw. We concluded that disabling the app was the right course of action as this bug could allow someone to listen through another customer's iPhone without consent.
And only yesterday, Apple deleted Zoom server software from all Macs globally after an entirely separate bug.More news: Ariana Grande grieves Mac Miller’s death in new interview
We've asked Apple for more information about the incident and will update this story with any response.