CVE-2018-4221

7.5 highEPSS 1.2%

An issue was discovered in certain Apple products. iOS before 11.4 is affected. macOS before 10.13.5 is affected. The issue involves the "Security" component. It allows web sites to track users by leveraging the transmission of S/MIME client certificates.

Severity

CVSS 3.0

7.5 high

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 1.2% chance of exploitation in the next 30 days; higher than 68% of CVEs (scores of 2026-10-31)
CWE: CWE-200
Published: 2018-06-08
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

apple:iphone_os
apple:mac_os_x

References

http://www.securityfocus.com/bid/104897
http://www.securitytracker.com/id/1041027
https://support.apple.com/HT208848
https://support.apple.com/HT208849
http://www.securityfocus.com/bid/104897

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