CVE-2019-8645: Apple Mac OS X

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue existed in the handling of encrypted Mail. This issue was addressed with improved isolation of MIME in Mail. This issue is fixed in macOS Mojave 10.14.4, Security Update 2019-002 High Sierra, Security Update 2019-002 Sierra. An attacker in a privileged network position may be able to intercept the contents of S/MIME-encrypted e-mail.

Affected products

• Apple Mac OS X: before 10.14.4 (fixed in 10.14.4)

Published 2020-10-27. Last modified 2026-06-17.