An issue was discovered in certain Apple products. iOS before 11.4 is affected. Safari before 11.1.1 is affected. The issue involves the "Safari" component. It allows remote attackers to cause a denial of service (persistent Safari outage) via a crafted web site.
Apple Security Advisory 2018-06-01-2 - Safari 11.1.1 is now available and addresses buffer overflow, code execution, and denial of service vulnerabilities.