CVE-2018-4174

5.9 mediumEPSS 1.5%

An issue was discovered in certain Apple products. iOS before 11.3 is affected. macOS before 10.13.4 is affected. The issue involves the "Mail" component. It allows man-in-the-middle attackers to read S/MIME encrypted messages by leveraging an inconsistency in the user interface.

Severity

CVSS 3.0

5.9 medium

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

EPSS: 1.5% chance of exploitation in the next 30 days; higher than 73% of CVEs (scores of 2026-10-31)
Published: 2018-04-03
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/103581
http://www.securitytracker.com/id/1040604
http://www.securitytracker.com/id/1040608
https://support.apple.com/HT208692
https://support.apple.com/HT208693

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