What is CVE-2016-4644?

CVE-2016-4644 is a medium-severity vulnerability in Apple Tv, classified under Information Disclosure. CVSS score: 6.5/10. Published 2019-01-11.

How severe is CVE-2016-4644?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Information disclosure in Apple Tv

CVE-2016-4644

In iOS before 9.3.3, tvOS before 9.2.2, and OS X El Capitan before v10.11.6 and Security Update 2016-004, a downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.

Vulnerability class: Information Disclosure

Published 2019-01-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.013 (70.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

support.apple.com/HT206902 (Vendor Advisory)
support.apple.com/HT206903 (Vendor Advisory)
support.apple.com/HT206905 (Vendor Advisory)

Frequently asked questions

What is CVE-2016-4644?: CVE-2016-4644 is a medium-severity vulnerability in Apple Tv, classified under Information Disclosure. CVSS score: 6.5/10. Published 2019-01-11.
How severe is CVE-2016-4644?: Medium severity. CVSS v3 base score is 6.5 out of 10.