What is CVE-2017-13786?

CVE-2017-13786 is a medium-severity vulnerability in Apple Mac OS X. CVSS score: 4.6/10. Published 2017-11-13.

How severe is CVE-2017-13786?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Vulnerability in Apple Mac OS X

CVE-2017-13786

An issue was discovered in certain Apple products. macOS before 10.13.1 is affected. The issue involves the "APFS" component. It does not properly restrict the DMA mapping time of FileVault decryption buffers, which allows attackers to read cleartext APFS data via a crafted Thunderbolt adapter.

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

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Apple Mac OS X

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-2017-13786?: CVE-2017-13786 is a medium-severity vulnerability in Apple Mac OS X. CVSS score: 4.6/10. Published 2017-11-13.
How severe is CVE-2017-13786?: Medium severity. CVSS v3 base score is 4.6 out of 10.