What is CVE-2016-4647?

CVE-2016-4647 is a high-severity vulnerability in Apple Mac OS X, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2016-07-22.

How severe is CVE-2016-4647?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Apple Mac OS X

CVE-2016-4647

Audio in Apple OS X before 10.11.6 allows local users to gain privileges or cause a denial of service (memory corruption) via a crafted file.

Vulnerability class: Buffer Overflow

Published 2016-07-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (27.4th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Apple Mac OS X

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.securityfocus.com/bid/91824 (vdb-entry)
lists.apple.com/archives/security-announce/2016/Jul/msg00000.html (vendor-advisory, Mailing List, Vendor Advisory)
zerodayinitiative.com/advisories/ZDI-16-437/ (Third Party Advisory)
www.securitytracker.com/id/1036348 (vdb-entry)
zerodayinitiative.com/advisories/ZDI-16-438/ (Third Party Advisory)
support.apple.com/HT206903 (Vendor Advisory)

Frequently asked questions

What is CVE-2016-4647?: CVE-2016-4647 is a high-severity vulnerability in Apple Mac OS X, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2016-07-22.
How severe is CVE-2016-4647?: High severity. CVSS v3 base score is 7.8 out of 10.