CVE-2018-4174
It allows man-in-the-middle attackers to read S/MIME encrypted messages by leveraging an inconsistency in the user interface.
Does this matter?
Lower severity and a low EPSS score (1.45%). Track it; it rarely justifies an emergency change on its own.
Description
An issue was discovered in certain Apple products. iOS before 11.3 is affected. macOS before 10.13.4 is affected. The issue involves the "Mail" component. It allows man-in-the-middle attackers to read S/MIME encrypted messages by leveraging an inconsistency in the user interface.
- CVSS 3.0
- 5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 1.45% probability · 73th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- apple/iphone os · apple/mac os x
- Source
- product-security@apple.com
EPSS 1.5% since 28 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/103581Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040604Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040608Third Party Advisory, VDB Entry
- https://support.apple.com/HT208692Vendor Advisory
- https://support.apple.com/HT208693Vendor Advisory
- http://www.securityfocus.com/bid/103581Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040604Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040608Third Party Advisory, VDB Entry
- https://support.apple.com/HT208692Vendor Advisory
- https://support.apple.com/HT208693Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.