CVE-2018-4247

Severity: medium (CVSS 6.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-08 · updated 2026-06-17
Weakness: CWE-20

Description

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.

Affected products

Apple Iphone Os: before 11.4 — fixed in 11.4
Apple Safari: before 11.1.1 — fixed in 11.1.1

How to fix

Upgrade to a fixed version: Apple Iphone Os 11.4; Apple Safari 11.1.1. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/104366
http://www.securitytracker.com/id/1041029
https://support.apple.com/HT208848
https://support.apple.com/HT208854
https://twitter.com/Nate_Kappa/status/1004399403220766725
http://www.securityfocus.com/bid/104366
http://www.securitytracker.com/id/1041029
https://support.apple.com/HT208848
https://support.apple.com/HT208854
https://twitter.com/Nate_Kappa/status/1004399403220766725

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