What is CVE-2016-4771?

CVE-2016-4771 is a medium-severity vulnerability in Apple Iphone OS, classified under Information Disclosure. CVSS score: 5.5/10. Published 2016-09-25.

How severe is CVE-2016-4771?

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

Information disclosure in Apple Iphone OS

CVE-2016-4771

The kernel in Apple iOS before 10 and OS X before 10.12 allows local users to bypass intended file-access restrictions via a crafted directory pathname.

Vulnerability class: Information Disclosure

Published 2016-09-25 · 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: 0.008 (54.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

www.securitytracker.com/id/1036858 (vdb-entry)
lists.apple.com/archives/security-announce/2016/Sep/msg00006.html (vendor-advisory, Mailing List, Vendor Advisory)
lists.apple.com/archives/security-announce/2016/Sep/msg00008.html (vendor-advisory, Mailing List, Vendor Advisory)
www.securityfocus.com/bid/93056 (vdb-entry)
support.apple.com/HT207170 (Vendor Advisory)
support.apple.com/HT207143 (Vendor Advisory)

Frequently asked questions

What is CVE-2016-4771?: CVE-2016-4771 is a medium-severity vulnerability in Apple Iphone OS, classified under Information Disclosure. CVSS score: 5.5/10. Published 2016-09-25.
How severe is CVE-2016-4771?: Medium severity. CVSS v3 base score is 5.5 out of 10.