CVE-2018-4248

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% 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-125

Description

An out-of-bounds read was addressed with improved input validation. This issue affected versions prior to iOS 11.4.1, macOS High Sierra 10.13.6, tvOS 11.4.1, watchOS 4.3.2.

Affected products

Apple Iphone Os: before 11.4.1 — fixed in 11.4.1
macOS: before 10.13.6 — fixed in 10.13.6
Apple tvOS: before 11.4.1 — fixed in 11.4.1
Apple watchOS: before 4.3.2 — fixed in 4.3.2

How to fix

Upgrade to a fixed version: Apple Iphone Os 11.4.1; macOS 10.13.6; Apple tvOS 11.4.1; Apple watchOS 4.3.2. Check the vendor advisory for mitigations.

References

https://support.apple.com/kb/HT208935
https://support.apple.com/kb/HT208936
https://support.apple.com/kb/HT208937
https://support.apple.com/kb/HT208938
https://support.apple.com/kb/HT208935
https://support.apple.com/kb/HT208936
https://support.apple.com/kb/HT208937
https://support.apple.com/kb/HT208938

Get alerted when CVE-2018-4248 or the next vulnerability affects your stack