CVE-2015-5884: Apple Mac OS X

Low severity, CVSS 3.3. EPSS: 0.5% chance of exploitation in the next 30 days.

The Mail Drop feature in Mail in Apple OS X before 10.11 mishandles encryption parameters for attachments, which makes it easier for remote attackers to obtain sensitive information by sniffing the network during transmission of an S/MIME e-mail message with a large attachment.

Affected products

• Apple Mac OS X: up to and including 10.10.5

Published 2015-10-09. Last modified 2026-06-17.