CVE-2019-8774

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-27 · updated 2026-06-17
Weakness: CWE-20

Description

A resource exhaustion issue was addressed with improved input validation. This issue is fixed in iOS 13.1 and iPadOS 13.1, macOS Catalina 10.15. Parsing a maliciously crafted iBooks file may lead to a persistent denial-of-service.

Affected products

Apple Ipad Os: before 13.1 — fixed in 13.1
Apple Iphone Os: before 13.1 — fixed in 13.1
macOS: before 10.15 — fixed in 10.15

How to fix

Upgrade to a fixed version: Apple Ipad Os 13.1; Apple Iphone Os 13.1; macOS 10.15. Check the vendor advisory for mitigations.

References

https://support.apple.com/en-us/HT210603
https://support.apple.com/en-us/HT210634
https://support.apple.com/en-us/HT210603
https://support.apple.com/en-us/HT210634

Get alerted when CVE-2019-8774 or the next vulnerability affects your stack