# CVE-2016-4657: Apple iOS Webkit Memory Corruption Vulnerability

> CVE-2016-4657: Apple iOS Webkit Memory Corruption Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2016-4657
Last updated: 2025-10-21T23:55:50Z

- Published: 2016-08-25 21:00 UTC · Updated: 2025-10-21 23:55 UTC · Assigner: apple
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 66.8%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-05-24, federal due date 2022-06-14, ransomware use: Unknown

## Description

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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Apple: iOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2016-4657)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2016-4657)
- [http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html](http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html)
- [https://blog.lookout.com/blog/2016/08/25/trident-pegasus/](https://blog.lookout.com/blog/2016/08/25/trident-pegasus/)
- [https://support.apple.com/HT207107](https://support.apple.com/HT207107)
- [https://www.exploit-db.com/exploits/44836/](https://www.exploit-db.com/exploits/44836/)
- [https://www.youtube.com/watch?v=xkdPjbaLngE](https://www.youtube.com/watch?v=xkdPjbaLngE)
- [http://www.securityfocus.com/bid/92653](http://www.securityfocus.com/bid/92653)
- [http://www.securitytracker.com/id/1036694](http://www.securitytracker.com/id/1036694)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2016-4657 · Markdown: https://rewindex.com/cve/CVE-2016-4657.md · JSON: https://rewindex.com/api/v1/cves/CVE-2016-4657 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:01:45.827Z