CVE-2020-27918: Apple iCloud

High severity, CVSS 7.8. EPSS: 1.4% chance of exploitation in the next 30 days.

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, Safari 14.0.1, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected products

• Apple iCloud: before 11.5 (fixed in 11.5)
• Apple iPadOS: before 14.2 (fixed in 14.2)
• Apple iPhone OS: before 14.2 (fixed in 14.2)
• Apple iTunes: before 12.11 (fixed in 12.11)
• Apple macOS: before 11.0.1 (fixed in 11.0.1)
• Apple Safari: before 14.0.1 (fixed in 14.0.1)
• Apple tvOS: before 14.2 (fixed in 14.2)
• Apple watchOS: before 7.1 (fixed in 7.1)
• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• WebKitGTK Webkitgtk+: before 2.30.6 (fixed in 2.30.6)

Published 2020-12-08. Last modified 2026-06-17.