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CVE-2018-4174

20
FAUCET Score

CVE-2018-4174 is a medium-severity vulnerability affecting Apple iOS before 11.3 and macOS before 10.13.4, specifically within the Mail component. It allows man-in-the-middle (MITM) attackers to decrypt and read S/MIME encrypted messages due to an inconsistency in the user interface. The attack requires high complexity but does not necessitate user interaction or privileges, leading to a high confidentiality impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 11.3CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
< 10.13.4CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.51%
Probability of exploitation in next 30 days
EPSS Percentile
71.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0151 is in the 46th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

applevendor investigatingvia nvd_reference
View patch

References

support.apple.com / HT208692
Vendor Advisory
support.apple.com / HT208693
Vendor Advisory
securityfocus.com / bid/103581
Third Party AdvisoryVDB Entry
securitytracker.com / id/1040604
Third Party AdvisoryVDB Entry
securitytracker.com / id/1040608
Third Party AdvisoryVDB Entry