High 7.5Published Apr 3, 2019

CVE-2018-4398An issue existed in the method for determining prime numbers.

Updated under an hour ago (Nov 2, 2026, 12:10 AM ET)

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It affects apple iphone_os and 5 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Start free and add your stackFree account, 3 products Every CVE for apple iphone_os Exploited in the last 30 days

An issue existed in the method for determining prime numbers. This issue was addressed by using pseudorandom bases for testing of primes. This issue affected versions prior to iOS 12.1, macOS Mojave 10.14.1, tvOS 12.1, watchOS 5.1, iTunes 12.9.1, iCloud for Windows 7.8.

CVSS: 7.5 HIGH (v3.0, NVD)CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

apple iphone_os apple:iphone_os	before 12.1	NVD
apple mac_os_x apple:mac_os_x	before 10.14.1	NVD
apple tvos apple:tvos	before 12.1	NVD
apple watchos apple:watchos	before 5.1	NVD
apple icloud apple:icloud	before 7.8	NVD
apple itunes apple:itunes	before 12.9.1	NVD

References

References

https://support.apple.com/kb/HT209192	vendor-advisory
https://support.apple.com/kb/HT209193	vendor-advisory
https://support.apple.com/kb/HT209194	vendor-advisory
https://support.apple.com/kb/HT209195	vendor-advisory
https://support.apple.com/kb/HT209197	vendor-advisory
https://support.apple.com/kb/HT209198	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.