CVE-2023-40385

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-01-10 · updated 2026-06-17
Weakness: CWE-200

Description

This issue was addressed by removing the vulnerable code. This issue is fixed in macOS Sonoma 14, Safari 17, iOS 17 and iPadOS 17. A remote attacker may be able to view leaked DNS queries with Private Relay turned on.

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 Safari: before 17.0 — fixed in 17.0

How to fix

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

References

https://support.apple.com/en-us/HT213938
https://support.apple.com/en-us/HT213940
https://support.apple.com/en-us/HT213941
https://support.apple.com/en-us/HT213938
https://support.apple.com/en-us/HT213940
https://support.apple.com/en-us/HT213941

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