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

CVE-2018-4398 is fixed in iTunes on 1 platform by iTunes 12.11.4.15 (version 12.11.4.15), released August 4, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-4398
- Priority: High
- CVSS: 7.5
- EPSS: 0.0163
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 3, 2019
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2018-4398

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | iTunes | 12.11.4.15 | [iTunes 12.11.4.15](https://patchblox.com/security/data/fix/windows-app/apple.itunes-12.11.4.15.md) | Aug 4, 2021 |

---

Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo