What is CVE-2017-13840?

CVE-2017-13840 is a medium-severity vulnerability in Apple Mac OS X, classified under Information Disclosure. CVSS score: 5.5/10. Published 2017-11-13.

How severe is CVE-2017-13840?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Information disclosure in Apple Mac OS X

CVE-2017-13840

An issue was discovered in certain Apple products. macOS before 10.13.1 is affected. The issue involves the "Kernel" component. It allows attackers to bypass intended memory-read restrictions via a crafted app.

Vulnerability class: Information Disclosure

Published 2017-11-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.4th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Apple Mac OS X

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

support.apple.com/HT208221 (Vendor Advisory)
www.securitytracker.com/id/1039710 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-13840?: CVE-2017-13840 is a medium-severity vulnerability in Apple Mac OS X, classified under Information Disclosure. CVSS score: 5.5/10. Published 2017-11-13.
How severe is CVE-2017-13840?: Medium severity. CVSS v3 base score is 5.5 out of 10.