CVE-2016-4763

What it is

WKWebView in WebKit in Apple iOS before 10, iTunes before 12.5.1 on Windows, and Safari before 10 does not properly verify X.509 certificates from HTTPS servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data exposure, data tampering.

Exploit odds

1.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2016-09-25 10:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:48 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.2% in the next 30 days (EPSS).
• Severity: 6.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2016-09-25 10:59 UTC

Last modified

2026-06-17 00:48 UTC

Exploit probability

1.2% · EPSS, next 30 days

Weakness

CWE-310

Record status

Modified

Affected

• Apple Itunes ≤ 12.4.3
• Apple Safari ≤ 9.1.3
• Apple Iphone Os ≤ 9.3.5

Attack profile CVSS 3.0 · 6.8

Attack vector

Network

Complexity

High

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

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