What is CVE-2018-4220?

CVE-2018-4220 is a high-severity vulnerability in Apple Swift, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 8.8/10. Published 2018-06-08.

How severe is CVE-2018-4220?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2018-4220 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Apple Swift

CVE-2018-4220

An issue was discovered in certain Apple products. Swift before 4.1.1 Security Update 2018-001 is affected. The issue involves the "Swift for Ubuntu" component. It allows attackers to execute arbitrary code in a privileged context because write and execute permissions are enabled during library loading.

Published 2018-06-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (81.5th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.021 · change: -0.001

Affected products

Apple Swift

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

support.apple.com/HT208804 (Vendor Advisory)
www.securityfocus.com/bid/104085 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-4220?: CVE-2018-4220 is a high-severity vulnerability in Apple Swift, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 8.8/10. Published 2018-06-08.
How severe is CVE-2018-4220?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2018-4220 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.