CVE-2020-9876: Apple iCloud

High severity, CVSS 7.8. EPSS: 2% chance of exploitation in the next 30 days.

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8, watchOS 6.2.8, iTunes 12.10.8 for Windows, iCloud for Windows 11.3, iCloud for Windows 7.20. Opening a maliciously crafted PDF file may lead to an unexpected application termination or arbitrary code execution.

Affected products

• Apple iCloud: before 7.20 (fixed in 7.20); from 10.0, before 11.5 (fixed in 11.5)
• Apple iPadOS: before 14.0 (fixed in 14.0)
• Apple iPhone OS: before 14.0 (fixed in 14.0)
• Apple iTunes: before 12.10.9 (fixed in 12.10.9)
• 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 10.15.6 (fixed in 10.15.6); version 10.13.6 only; version 10.14.6 only
• Apple macOS: from 11.0, up to and including 11.0.1
• Apple tvOS: before 14.0 (fixed in 14.0)
• Apple watchOS: before 7.0 (fixed in 7.0)

Published 2020-10-22. Last modified 2026-06-17.