CVE-2016-4763

Publication date 25 September 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
qtwebkit-source	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Ignored no update available
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Ignored end of life
webkit	16.10 yakkety	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Ignored end of life
webkit2gtk	16.10 yakkety	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not in release
webkitgtk	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Ignored no update available
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not in release
qtwebkit-opensource-src	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Ignored no update available
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not in release

Notes

jdstrand

webkit receives limited support. For details, see https://wiki.ubuntu.com/SecurityTeam/FAQ#webkit webkit in Ubuntu uses the JavaScriptCore (JSC) engine, not V8

Severity score breakdown

Parameter	Value
Base score	6.8 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N