CVE-2018-4302: Apple iCloud

High severity, CVSS 7.8. EPSS: 0.9% chance of exploitation in the next 30 days.

A null pointer dereference was addressed with improved validation. This issue is fixed in macOS High Sierra 10.13, iCloud for Windows 7.0, watchOS 4, iOS 11, iTunes 12.7 for Windows. Processing maliciously crafted XML may lead to an unexpected application termination or arbitrary code execution.

Affected products

• Apple iCloud: up to and including 7.0
• Apple iPhone OS: before 11 (fixed in 11)
• Apple iTunes: before 12.7 (fixed in 12.7)
• Apple Mac OS X: before 10.13 (fixed in 10.13)
• Apple watchOS: before 4 (fixed in 4)

Published 2021-12-23. Last modified 2026-06-17.