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CVE-2018-4391

21
FAUCET Score

CVE-2018-4391 describes a user interface (UI) spoofing vulnerability affecting Apple's iOS, macOS, and watchOS. This flaw, stemming from inconsistent UI state management, could be triggered by processing a specially crafted text message. With a CVSS score of 5.5 (Medium), the vulnerability requires user interaction (UI:R) and local access (AV:L) to achieve a high impact on integrity (I:H) by misleading the user through UI manipulation. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 12.1CPE matchmatch criteria
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
>= 10.13, < 10.13.1CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
< 4.3CPE matchmatch criteria
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
< 10.13CPE match
cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*
< 12.1CPE match
cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.87%
Probability of exploitation in next 30 days
EPSS Percentile
55.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0087 is in the 63rd percentile among its peer group of 5,765 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 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 / en-us/HT208221
Vendor Advisory
support.apple.com / en-us/HT208696
Vendor Advisory
support.apple.com / en-us/HT209192
Vendor Advisory