What’s Vulnerable › Vulnerabilities

CVE-2020-9944

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% 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-125

Description

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.0, tvOS 14.0, iOS 14.0 and iPadOS 14.0. An application may be able to read restricted memory.

Affected products

• Apple iPadOS: before 14.0 — fixed in 14.0
• Apple Iphone Os: before 14.0 — fixed in 14.0
• macOS: before 11.1; from 10.14 before 10.14.6; from 10.15 before 10.15.7; 10.14.6, 10.14.6-security_update_2019-001, 10.14.6-security_update_2019-002, 10.14.6-security_update_2019-004, 10.14.6-security_update_2019-005, 10.14.6-security_update_2019-006 (+8) — fixed in 10.14.6, 10.15.7, 11.1
• 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 10.14.6, 10.15.7, 11.1; Apple tvOS 14.0; Apple watchOS 7.0. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2020/Dec/26
• http://seclists.org/fulldisclosure/2020/Dec/32
• 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
• https://support.apple.com/kb/HT212011
• http://seclists.org/fulldisclosure/2020/Dec/26
• http://seclists.org/fulldisclosure/2020/Dec/32
• https://support.apple.com/en-us/HT211843
• https://support.apple.com/en-us/HT211844
• https://support.apple.com/en-us/HT211850

Get alerted when CVE-2020-9944 or the next vulnerability affects your stack