CVE-2017-2491: Apple iPhone OS

High severity, CVSS 8.8. EPSS: 8% chance of exploitation in the next 30 days.

Use after free vulnerability in the String.replace method JavaScriptCore in Apple Safari in iOS before 10.3 allows remote attackers to execute arbitrary code via a crafted web page, or a crafted file.

Affected products

• Apple iPhone OS: up to and including 10.2.1

Published 2017-06-27. Last modified 2026-06-17.