How severe is CVE-2018-4339?

CVE-2018-4339 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-4339 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4339?

CVE-2018-4339 affects Apple Iphone Os. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4339?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-4339 published?

CVE-2018-4339 was published on 2020-10-27 and last updated on 2026-06-17.

CVE-2018-4339

CVE-2018-4339 is a medium-severity vulnerability in Apple Iphone Os with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apple Iphone Os
Published: 2020-10-27
Last modified: 2026-06-17

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.

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 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-4339 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4339?: CVE-2018-4339 affects Apple Iphone Os. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4339?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-4339 published?: CVE-2018-4339 was published on 2020-10-27 and last updated on 2026-06-17.

References

https://support.apple.com/en-us/HT209192

Affected products (1)

cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*

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