CVE-2018-4321

Severity: medium (CVSS 5.3 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-04-03 · updated 2026-06-17
Weakness: CWE-20

Description

A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the process entitlement. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12.

Affected products

Apple Iphone Os: before 12.0 — fixed in 12.0
macOS: before 10.14 — fixed in 10.14
Apple tvOS: before 12 — fixed in 12

How to fix

Upgrade to a fixed version: Apple Iphone Os 12.0; macOS 10.14; Apple tvOS 12. Check the vendor advisory for mitigations.

References

https://support.apple.com/kb/HT209106
https://support.apple.com/kb/HT209107
https://support.apple.com/kb/HT209139
https://support.apple.com/kb/HT209106
https://support.apple.com/kb/HT209107
https://support.apple.com/kb/HT209139

Get alerted when CVE-2018-4321 or the next vulnerability affects your stack