As Apple has released the iOS 14.4, we now finally have access to the security content of it, which shows two very important vulnerabilities have been patched which are usable for a Jailbreak for iOS 14.3, iOS 14.2, iOS 14.1, and so on, particularly on the A12, A13 and the A14 devices.
The Kernel and the WebKit vulnerabilities addressed by Apple in the iOS 14.4 and iPadOS 14.4 updates seem to be already used in the wild and they seem to be very powerful, to the point where code execution is achieved – this is particularly useful for the Jailbreak community, and with these vulnerabilities now fully patched by Apple, they may soon be released in form of a write-up by a who-knows-what security company. Do NOT update to iOS 14.4 if you wanna jailbreak.
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~ GeoSn0w