CVE-2023-40400

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-09-27 · updated 2026-06-17

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.

Affected products

Apple iPadOS: before 16.6 — fixed in 16.6
Apple Iphone Os: before 16.6 — fixed in 16.6
Apple macOS: before 14.0 — fixed in 14.0
Apple tvOS: before 17.0 — fixed in 17.0
Apple watchOS: before 10.0 — fixed in 10.0

How to fix

Upgrade to a fixed version: Apple iPadOS 16.6; Apple Iphone Os 16.6; Apple macOS 14.0; Apple tvOS 17.0; Apple watchOS 10.0. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2023-40400 or the next vulnerability affects your stack