CVE-2023-40391

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-09-27 · updated 2026-06-17

Description

The issue was addressed with improved memory handling. This issue is fixed in tvOS 17, iOS 17 and iPadOS 17, macOS Sonoma 14, Xcode 15. An app may be able to disclose kernel memory.

Affected products

Apple iPadOS: before 17.0 — fixed in 17.0
Apple Iphone Os: before 17.0 — fixed in 17.0
Apple macOS: before 14.0 — fixed in 14.0
Apple tvOS: before 17.0 — fixed in 17.0
Apple Xcode: before 15.0 — fixed in 15.0

How to fix

Upgrade to a fixed version: Apple iPadOS 17.0; Apple Iphone Os 17.0; Apple macOS 14.0; Apple tvOS 17.0; Apple Xcode 15.0. 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/7
http://seclists.org/fulldisclosure/2023/Oct/8
https://support.apple.com/en-us/HT213936
https://support.apple.com/en-us/HT213938
https://support.apple.com/en-us/HT213939
https://support.apple.com/en-us/HT213940
http://seclists.org/fulldisclosure/2023/Oct/10
http://seclists.org/fulldisclosure/2023/Oct/3
http://seclists.org/fulldisclosure/2023/Oct/7
http://seclists.org/fulldisclosure/2023/Oct/8

Get alerted when CVE-2023-40391 or the next vulnerability affects your stack