Apple Security Advisory 2017-09-25-4 - iOS 11 addresses denial of service, service impersonation, and various other vulnerabilities.
63d7ee9aed6f2dbe84b1bde7894ca17abe7eb97f4cfd69dcb8570468e235d4a4
Apple Security Advisory 2017-09-20-1 - This advisory provides additional information for APPLE-SA-2017-09-19-1 iOS 11.
8aeb5a27b696a6b9371d6de6e28fa2fbc84fc7b2623227bae3da19122efca2d6
Apple Security Advisory 2017-09-19-1 - iOS 11 is now available and addresses cross site scripting, denial of service, and various other vulnerabilities.
865ddf6e4616468e824f454d3cd875358dafbfd0bc8839b6bdf8c0c9a75125c5