What is CVE-2016-4764?

CVE-2016-4764 is a high-severity vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2017-02-20.

How severe is CVE-2016-4764?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Apple Iphone OS

CVE-2016-4764

An issue was discovered in certain Apple products. iOS before 10 is affected. Safari before 10 is affected. iTunes before 12.5.1 is affected. tvOS before 10 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.

Vulnerability class: Buffer Overflow

Published 2017-02-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Weakness classification (CWE)

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

References

support.apple.com/HT207157 (Vendor Advisory)
www.securityfocus.com/bid/94430 (VDB Entry, Third Party Advisory, vdb-entry)
support.apple.com/HT207158 (Vendor Advisory)
support.apple.com/HT207142 (Vendor Advisory)
support.apple.com/HT207143 (Vendor Advisory)

Frequently asked questions

What is CVE-2016-4764?: CVE-2016-4764 is a high-severity vulnerability in Apple Iphone OS, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2017-02-20.
How severe is CVE-2016-4764?: High severity. CVSS v3 base score is 8.8 out of 10.