What’s Vulnerable › Vulnerabilities

CVE-2020-9955

• Severity: high (CVSS 7.8 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: 2021-04-02 · 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 watchOS 7.0, tvOS 14.0, iOS 14.0 and iPadOS 14.0, macOS Big Sur 11.0.1. Processing a maliciously crafted image may lead to arbitrary code execution.

Affected products

• Apple iPadOS: before 14.0 — fixed in 14.0
• Apple Iphone Os: before 14.0 — fixed in 14.0
• Apple macOS: from 11.0 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 iPadOS 14.0; Apple Iphone Os 14.0; Apple macOS 11.0.1; Apple tvOS 14.0; Apple watchOS 7.0. Check the vendor advisory for mitigations.

References

• 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/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-2020-9955 or the next vulnerability affects your stack