iOS 5 HFS Heap Buffer Overflow

From The Apple Wiki

An exploit is available in iOS 5's iBoot that abuses a heap buffer overflow bug. The exploit was discovered by p0sixninja.

The exploit has been shown to be able to untethered verbose boot the original iPad.

Support for untethered downgrades on the iPod touch (3rd generation) via this exploit was planned in powdersn0w [Archived 2022-07-20 at the Wayback Machine], and eventually accomplished in Legacy iOS Kit after the discontinuation of powdersn0w.

The exploit should also be available in iOS 4 or earlier. It was patched in iOS 6.

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