CVE-2020-3878: Apple iCloud

High severity, CVSS 7.8. EPSS: 9.4% chance of exploitation in the next 30 days.

An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 13.5 and iPadOS 13.5, macOS Catalina 10.15.5, tvOS 13.4.5, watchOS 6.2.5, iTunes 12.10.7 for Windows, iCloud for Windows 11.2, iCloud for Windows 7.19. Processing a maliciously crafted image may lead to arbitrary code execution.

Affected products

• Apple iCloud: before 7.19 (fixed in 7.19); from 11.0, before 11.2 (fixed in 11.2)
• Apple iPadOS: before 13.5 (fixed in 13.5)
• Apple iPhone OS: before 13.5 (fixed in 13.5)
• Apple iTunes: before 12.10.7 (fixed in 12.10.7)
• Apple Mac OS X: from 10.13, before 10.13.6 (fixed in 10.13.6); from 10.14, before 10.14.6 (fixed in 10.14.6); from 10.15, before 10.15.5 (fixed in 10.15.5); version 10.13.6 only; version 10.14.6 only
• Apple tvOS: before 13.4.5 (fixed in 13.4.5)
• Apple watchOS: before 6.2.5 (fixed in 6.2.5)

Published 2020-02-27. Last modified 2026-06-17.