A null pointer dereference was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.4, Safari 14.1.1, iOS 14.6 and iPadOS 14.6. A remote attacker may be able to cause a denial of service.Referenceshttps://support.apple.com/en-us/HT212528https://support.apple.com/en-us/HT212529https://support.apple.com/en-us/HT212534
