What is CVE-2017-13909?

CVE-2017-13909 is a medium-severity vulnerability in Apple macOS, classified under CWE-922. CVSS score: 5.5/10. Published 2021-12-23.

How severe is CVE-2017-13909?

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

Vulnerability in Apple macOS

CVE-2017-13909

An issue existed in the storage of sensitive tokens. This issue was addressed by placing the tokens in Keychain. This issue is fixed in macOS High Sierra 10.13. A local attacker may gain access to iCloud authentication tokens.

Published 2021-12-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (12.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Apple macOS — versions unspecified
Apple Mac OS X

Weakness classification (CWE)

CWE-922

References

support.apple.com/en-us/HT208144 (Vendor Advisory)

Frequently asked questions

What is CVE-2017-13909?: CVE-2017-13909 is a medium-severity vulnerability in Apple macOS, classified under CWE-922. CVSS score: 5.5/10. Published 2021-12-23.
How severe is CVE-2017-13909?: Medium severity. CVSS v3 base score is 5.5 out of 10.