CVE-2018-4221 json
An issue was discovered in certain Apple products.
published 2018-06-08 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16007
- cvss
- 7.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
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 "Security" component. It allows web sites to track users by leveraging the transmission of S/MIME client certificates.
Patch / fix
- apple iphone_os 11.4
- apple mac_os_x 10.13.5
Exploit prediction
1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
support.apple.com
/HT208848
vendor-advisory
-
support.apple.com
/HT208849
vendor-advisory
-
securitytracker.com
/id/1041027
vdb-entry, third-party-advisory
-
securityfocus.com
/bid/104897
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2018-4221
- NVD CVE-2018-4221
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.