IOS 15.5 build 19F77

iOS 15.5 build 19F77 is the official RTM build of iOS 15.5, which was released to the public on 16 May 2022. Prior to that, it was released as a release candidate four days earlier on 12 May. This build fixes the CVE-2022-26763 vulnerability, which allowed an application to execute arbitrary code with system privileges.