CVE-2016-4657

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a...

8.8 HighIn KEVPublic exploitFix available

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

66.8%Up 27.5 points since Feb 4, 2022

What each source reports

NVD Score used 8.8

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

Record: CVE-2016-4657
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-787
Updated: 2026-11-02

CVE List 8.8

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

Record: CVE-2016-4657
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

EUVDEUVD-2016-5643 8.8

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

Record: EUVD-2016-5643
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-99xm-29ff-vvqm 8.8

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a...

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

Record: GHSA-99xm-29ff-vvqm
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-119, CWE-787
Updated: 2026-11-02

CISA KEV No score

Apple iOS Webkit Memory Corruption Vulnerability

Apple iOS WebKit contains a memory corruption vulnerability that allows attackers to execute remote code or cause a denial-of-service (DoS) via a crafted web site. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

Record: CVE-2016-4657
Weakness: CWE-119
Updated: 2026-11-02

OSVUBUNTU-CVE-2016-4657 8.8

WebKit in Apple iOS before 9.3.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.

Record: UBUNTU-CVE-2016-4657
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVMGASA-2017-0069 No score

Updated webkit2 packages fix security vulnerabilities

The webkit2 package has been updated to version 2.14.5, fixing several security issues and other bugs.

Record: MGASA-2017-0069
Updated: 2026-11-02

OSVUSN-3166-1 No score

webkit2gtk vulnerabilities

A large number of security issues were discovered in the WebKitGTK+ Web and JavaScript engines. If a user were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary code execution.

Record: USN-3166-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`webkit2` Mageia:5 From an advisory covering 60 CVEs	before 2.14.5-1.mga5	2.14.5-1.mga5
`webkit2gtk` Ubuntu:16.04:LTS	before 2.14.2-0ubuntu0.16.04.1, plus listed versions 2.8.5+dfsg1-32.10.3+dfsg1-12.10.4+dfsg1-12.10.5-12.10.6-1 Show 4 moreShow less 2.10.6-1ubuntu12.10.8-1ubuntu12.10.9-1ubuntu12.12.5-0ubuntu0.16.04.1	2.14.2-0ubuntu0.16.04.1
`qtwebkit-opensource-src` Ubuntu:16.04:LTS	All versions, plus listed versions 5.4.2+dfsg-1ubuntu2.15.5.1+dfsg-2ubuntu1	None known
`qtwebkit-source` Ubuntu:16.04:LTS	All versions, plus listed versions 2.3.2-0ubuntu102.3.2-0ubuntu11	None known
`webkitgtk` Ubuntu:16.04:LTS	All versions, plus listed versions 2.4.9-2ubuntu22.4.10-0ubuntu12.4.11-0ubuntu0.1	None known
`webkit2gtk` Ubuntu:16.04:LTS From an advisory covering 18 CVEs	before 2.14.2-0ubuntu0.16.04.1, plus listed versions 2.8.5+dfsg1-32.10.3+dfsg1-12.10.4+dfsg1-12.10.5-12.10.6-1 Show 4 moreShow less 2.10.6-1ubuntu12.10.8-1ubuntu12.10.9-1ubuntu12.12.5-0ubuntu0.16.04.1	2.14.2-0ubuntu0.16.04.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Metasploit	WebKit not_number defineProperties UAF	2016-08-25
Exploit-DB	Nintendo Switch - WebKit Code Execution (PoC)	2017-03-12
PoC in GitHub	Mimoja/CVE-2016-4657-NintendoSwitch	2017-03-13
PoC in GitHub	iDaN5x/Switcheroo	2017-06-02
Exploit-DB	WebKit - not_number defineProperties UAF (Metasploit)	2018-06-05
PoC in GitHub	viai957/webkit-vulnerability	2018-11-11

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected
Nov 3, 2026	exploitation, exploits
Nov 2, 2026	first indexed	CVE List, EUVD, Exploit-DB, GitHub Advisories, CISA KEV, Metasploit, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-4657 is a high vulnerability (CVSS 8.8) in Apple Ios, published August 25, 2016. CISA lists it as known to be exploited, since May 24, 2022. EUVD reports exploitation since May 24, 2022. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 66.8%, the 99th percentile. Fixed in webkit2gtk 2.14.2-0ubuntu0.16.04.1.

References

Show 37 moreShow less