What’s Vulnerable › Vulnerabilities

CVE-2020-9949

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% 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-416

Description

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.0, iOS 14.0 and iPadOS 14.0, macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra, tvOS 14.0. An application may be able to execute arbitrary code with kernel privileges.

Affected products

• Apple iPadOS: before 14.0 — fixed in 14.0
• Apple Iphone Os: before 14.0 — fixed in 14.0
• macOS: before 10.15.6; from 11.0.0 before 11.0.1 — fixed in 10.15.6, 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 iPadOS 14.0; Apple Iphone Os 14.0; macOS 10.15.6, 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/HT211289
• https://support.apple.com/en-us/HT211843
• https://support.apple.com/en-us/HT211844
• https://support.apple.com/en-us/HT211850
• https://support.apple.com/en-us/HT211931
• http://seclists.org/fulldisclosure/2020/Dec/32
• https://support.apple.com/en-us/HT211289
• https://support.apple.com/en-us/HT211843
• https://support.apple.com/en-us/HT211844
• https://support.apple.com/en-us/HT211850
• https://support.apple.com/en-us/HT211931

Get alerted when CVE-2020-9949 or the next vulnerability affects your stack