Unpatchable 'usbliter8' Exploit Breaks Apple A12 and A13 SecureROM Boot Chain
Jun 19, 2026
Hardware Security / Vulnerability
Security researchers at Paradigm Shift have published a working exploit, dubbed usbliter8 , that achieves arbitrary code execution inside the SecureROM of Apple's A12 and A13 chips. That code is burned into the silicon at manufacture. No software update can reach it. Affected devices will carry this flaw for as long as they stay in use. This is not a remote attack. It requires physical possession of the device, which must be in DFU mode and connected via USB to a dedicated RP2350-based microcontroller board. With that setup, the exploit finishes in under two seconds, before Apple's signed boot chain loads. The full technical write-up and a working proof of concept went public on June 18, 2026, following coordinated disclosure with Apple Product Security. Affected Devices The public PoC supports A12, A13, S4, and S5 SoCs. A12X and A12Z support is described as theoretically possible but not yet implemented. Device families in that range...
