Many may recall the PS4 Firmware 4.01 Jailbreak by Chaitin Tech, their ROP Tool and the addition of Kaslr Support last year.
Following his PS4 4.0x WebKit Userland Exploit Documentation, JailbreakMe PS4 3.5x / 3.70 / 4.0x Exploit Ports and continuing research PlayStation 4 developer SpecterDev...