CVE-2018-4227
CVSS v3
7.5
HIGH
EPSS Score
1.9 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
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 "Mail" component. It allows remote attackers to read the cleartext content of S/MIME encrypted messages via direct exfiltration.
Technical details
- Published
- 2018-06-08
Frequently asked questions
What is CVE-2018-4227?
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 "Mail" component. It allows remote attackers to read the cleartext content of S/MIME encrypted messages via direct exfiltration.
Is CVE-2018-4227 actively exploited?
Active exploitation of CVE-2018-4227 has not been confirmed. Its EPSS score was 1.9% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2018-4227?
CVE-2018-4227 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2018-4227 affecting your environment?
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