CVE-2017-13871

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-12-25 · updated 2026-06-17

Description

An issue was discovered in certain Apple products. macOS before 10.13.2 is affected. The issue involves the "Mail" component. It allows remote attackers to read cleartext e-mail content (for which S/MIME encryption was intended) by leveraging the lack of installation of an S/MIME certificate by the recipient.

Affected products

macOS: before 10.13.2 — fixed in 10.13.2

How to fix

Upgrade to a fixed version: macOS 10.13.2. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/102099
http://www.securitytracker.com/id/1039966
https://support.apple.com/HT208331
http://www.securityfocus.com/bid/102099
http://www.securitytracker.com/id/1039966
https://support.apple.com/HT208331

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