iOS 15 (19A5261w)
iBoot : iBoot-7429.0.72.112.2
Kernel : Darwin Kernel Version 21.0.0: Sat May 22 02:37:35 PDT 2021; root:xnu-7938.0.0.112.1~5/RELEASE_ARM64_T8030
CVE-2023-4863: Heap buffer overflow in WebP. Reported by Apple SEAR and CitizenLab
Seems to be one of the bugs in ImageIO exploited in the latest iMessage exploit chain (BLASTPASS)
Here is a tip to use diags without a DCSD lightning cable.
In iBoot set a new boot-arg : setenv boot-args usbserial=enabled. Then run saveenv and boot diags.