CVE-2018-4227
It allows remote attackers to read the cleartext content of S/MIME encrypted messages via direct exfiltration.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.83%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 1.83% probability · 79th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-319
- Affected
- apple/iphone os · apple/mac os x
- Source
- product-security@apple.com
EPSS 1.8% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/104897Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041027Third Party Advisory, VDB Entry
- https://efail.de/#cveExploit, Third Party Advisory
- https://support.apple.com/HT208848Vendor Advisory
- https://support.apple.com/HT208849Vendor Advisory
- http://www.securityfocus.com/bid/104897Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041027Third Party Advisory, VDB Entry
- https://efail.de/#cveExploit, Third Party Advisory
- https://support.apple.com/HT208848Vendor Advisory
- https://support.apple.com/HT208849Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.