What’s Vulnerable › Vulnerabilities

CVE-2019-8591

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-12-18 · updated 2026-06-17
• Weakness: CWE-843

Description

A type confusion issue was addressed with improved memory handling. This issue is fixed in iOS 12.3, macOS Mojave 10.14.5, tvOS 12.3, watchOS 5.2.1. An application may be able to cause unexpected system termination or write kernel memory.

Affected products

• Apple Iphone Os: before 12.3 — fixed in 12.3
• macOS: before 10.14.5 — fixed in 10.14.5
• Apple tvOS: before 12.3 — fixed in 12.3
• Apple watchOS: before 5.2.1 — fixed in 5.2.1

How to fix

Upgrade to a fixed version: Apple Iphone Os 12.3; macOS 10.14.5; Apple tvOS 12.3; Apple watchOS 5.2.1. Check the vendor advisory for mitigations.

References

• https://support.apple.com/HT210118
• https://support.apple.com/HT210119
• https://support.apple.com/HT210120
• https://support.apple.com/HT210122
• https://support.apple.com/HT210118
• https://support.apple.com/HT210119
• https://support.apple.com/HT210120
• https://support.apple.com/HT210122

Get alerted when CVE-2019-8591 or the next vulnerability affects your stack