CVE-2018-4339

Name: CVE-2018-4339
Creator: NVD / NIST
Published: 2020-10-27T20:15:13.377+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2018-4339 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. This issue was addressed with a new entitlement. This issue is fixed in iOS 12.1. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

This issue was addressed with a new entitlement. This issue is fixed in iOS 12.1. A local user may be able to read a persistent device identifier.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.27%

17.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Apple	Iphone Os	< 12.1

References

https://support.apple.com/en-us/HT209192Vendor Advisory
https://support.apple.com/en-us/HT209192Vendor Advisory

Timeline

Published: Oct 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-4339?

This issue was addressed with a new entitlement. This issue is fixed in iOS 12.1. A local user may be able to read a persistent device identifier.

How severe is CVE-2018-4339?

CVE-2018-4339 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2018-4339?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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Source: NVD / NIST