What’s Vulnerable › Vulnerabilities

CVE-2020-9999

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-08 · updated 2026-06-17
• Weakness: CWE-787

Description

A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.0.1, iTunes for Windows 12.10.9. Processing a maliciously crafted text file may lead to arbitrary code execution.

Affected products

• Apple iCloud for Windows: before 11.5.0 — fixed in 11.5.0
• 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: before 11.0.1 — fixed in 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 11.5.0; Apple iPadOS 14.0; Apple Iphone Os 14.0; Apple iTunes for Windows 12.10.9; macOS 11.0.1; Apple tvOS 14.0; Apple watchOS 7.0. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2020/Dec/32
• https://support.apple.com/en-us/HT211931
• https://support.apple.com/en-us/HT211952
• https://support.apple.com/kb/HT211843
• https://support.apple.com/kb/HT211844
• https://support.apple.com/kb/HT211850
• https://support.apple.com/kb/HT211935
• http://seclists.org/fulldisclosure/2020/Dec/32
• https://support.apple.com/en-us/HT211931
• https://support.apple.com/en-us/HT211952
• https://support.apple.com/kb/HT211843
• https://support.apple.com/kb/HT211844

Get alerted when CVE-2020-9999 or the next vulnerability affects your stack