CVE-2020-9876

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-22 · updated 2026-06-17
Weakness: CWE-787

Description

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 for Windows: before 7.20; from 10.0 before 11.5 — fixed in 11.5, 7.20
Apple iPadOS: before 14.0 — fixed in 14.0
Apple Iphone Os: before 14.0 — fixed in 14.0
Apple iTunes for Windows: before 12.10.9 — fixed in 12.10.9
macOS: from 10.13 before 10.13.6; from 10.14 before 10.14.6; from 10.15 before 10.15.6; 10.13.6, 10.13.6-security_update_2018-002, 10.13.6-security_update_2018-003, 10.13.6-security_update_2019-001, 10.13.6-security_update_2019-002, 10.13.6-security_update_2019-003 (+17) — fixed in 10.13.6, 10.14.6, 10.15.6
Apple macOS: from 11.0 through 11.0.1
Apple tvOS: before 14.0 — fixed in 14.0
Apple watchOS: before 7.0 — fixed in 7.0

How to fix

Upgrade to a fixed version: Apple iCloud for Windows 11.5, 7.20; Apple iPadOS 14.0; Apple Iphone Os 14.0; Apple iTunes for Windows 12.10.9; macOS 10.13.6, 10.14.6, 10.15.6; Apple tvOS 14.0; Apple watchOS 7.0. Check the vendor advisory for mitigations.

References

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