CVE-2016-4657

HIGHNVD 8.89.0▲Trending — 5 sources updated this weekExploited in the wild

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.

CVSS v3: 8.8
EG Score: 9.0(high)
EPSS: 99.1%
KEV: ⚠ Exploited

Published

August 25, 2016

Last Modified

April 21, 2026

Advisory Details (4)

Auto-updated May 2, 2026

🔬 Proof of concept available. No patch confirmed yet.

generic

http://www.securityfocus.com/bid/92653

generic

https://www.youtube.com/watch?v=xkdPjbaLngE

generic🟡 PoC Available

WebKit - not_number defineProperties UAF (Metasploit) - iOS remote Exploit

https://www.exploit-db.com/exploits/44836/

generic

About the security content of iOS 9.3.5 - Apple Support

https://support.apple.com/HT207107

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libwebkit2gtk-4.0-doc (2.14.2-0ubuntu0.16.04.1) @ xenial	2026-06-04	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

UbuntuUSN-3166-1MEDIUM
WebKitGTK+ vulnerabilities

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 02:42 UTCEG score recompute
2026-06-04 02:42 UTCVendor advisory
2026-06-04 02:42 UTCGHSA enrichment
2026-06-03 22:49 UTCEG score recompute
2026-06-03 22:49 UTCVendor advisory
2026-06-03 22:49 UTCGHSA enrichment
2026-06-03 19:09 UTCkev_newly_listed
2026-06-03 18:56 UTCEG score recompute
2026-06-03 18:56 UTCVendor advisory
2026-06-03 18:56 UTCGHSA enrichment
2026-06-03 15:03 UTCEG score recompute
2026-06-03 15:03 UTCVendor advisory
2026-06-03 15:03 UTCGHSA enrichment
2026-06-03 11:10 UTCEG score recompute
2026-06-03 11:10 UTCVendor advisory
2026-06-03 11:10 UTCGHSA enrichment
2026-06-03 07:17 UTCEG score recompute
2026-06-03 07:17 UTCVendor advisory
2026-06-03 07:17 UTCGHSA enrichment
2026-06-03 03:24 UTCEG score recompute

Publicly available exploits

(6 references)

Working exploit code is in the public domain (1 Metasploit module) (3 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoCviai957/webkit-vulnerability
First seen Nov 11, 2018
CVE-2016-4657 web-kit vulnerability for ios 9.3, nintendo switch browser vulnerability
Open source ↗
Exploit-DBEDB-44836✓ verified
First seen Jun 5, 2018
WebKit - not_number defineProperties UAF (Metasploit)
Open source ↗
GitHub PoCiDaN5x/Switcheroo
First seen Jun 2, 2017
Exploiting CVE-2016-4657 to JailBreak the Nintendo Switch
Open source ↗
GitHub PoCMimoja/CVE-2016-4657-NintendoSwitch
First seen Mar 13, 2017
CVE-2016-4657 for NintendoSwitch rwx
Open source ↗
Exploit-DBEDB-44213
First seen Mar 12, 2017
Nintendo Switch - WebKit Code Execution (PoC)
Open source ↗
Metasploitexploit/apple_ios/browser/webkit_trident✓ verified
First seen Aug 25, 2016
WebKit not_number defineProperties UAF
Open source ↗

Frequently asked(6)

What is CVE-2016-4657?

CVE-2016-4657 is a high vulnerability published on August 25, 2016. 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.

When was CVE-2016-4657 disclosed?

CVE-2016-4657 was first published in the National Vulnerability Database on August 25, 2016, with the most recent update on April 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2016-4657 actively exploited?

Yes. CISA added CVE-2016-4657 to the Known Exploited Vulnerabilities catalog on May 24, 2022, affecting Apple iOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2016-4657?

CVE-2016-4657 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.

Which products are affected by CVE-2016-4657?

CVE-2016-4657 affects Apple iOS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2016-4657?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-4657, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2016-4657

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CVE-2016-4657

Published

Last Modified

Advisory Details (4)

WebKit - not_number defineProperties UAF (Metasploit) - iOS remote Exploit

About the security content of iOS 9.3.5 - Apple Support

Patch Availability(1)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2016-4657?

Same vendor

Same CWE

CVE-2016-4657

📅 Published

🔄 Last Modified

📋 Advisory Details (4)

WebKit - not_number defineProperties UAF (Metasploit) - iOS remote Exploit

About the security content of iOS 9.3.5 - Apple Support

Patch Availability(1)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(6)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2016-4657?

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