CVE-2023-40420

CVE-2023-40420: vulnerability in Apple macOS

Published 26 Sep 2023 · Updated 04 Nov 2025

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3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 1.4%

The issue was addressed with improved memory handling. This issue is fixed in macOS Ventura 13.6, tvOS 17, iOS 16.7 and iPadOS 16.7, macOS Monterey 12.7, watchOS 10, iOS 17 and iPadOS 17, macOS Sonoma 14. Processing web content may lead to a denial-of-service.

Affected products

Apple · iOS and iPadOS Apple · macOS Apple · tvOS Apple · watchOS

Related CVEs — Apple macOS

In the same product, most dangerous first.

CVE-2021-30860HIGHCVE-2021-30860EPSS 76.0%KEV CVE-2021-30657MEDIUMCVE-2021-30657EPSS 68.5%KEV CVE-2025-43300CRITICALCVE-2025-43300EPSS 65.2%KEV CVE-2023-41064HIGHCVE-2023-41064EPSS 53.4%KEV CVE-2023-32434HIGHCVE-2023-32434EPSS 51.5%KEV CVE-2021-30807HIGHCVE-2021-30807EPSS 28.8%KEV

References

http://seclists.org/fulldisclosure/2023/Oct/10 http://seclists.org/fulldisclosure/2023/Oct/3 http://seclists.org/fulldisclosure/2023/Oct/4 http://seclists.org/fulldisclosure/2023/Oct/5 http://seclists.org/fulldisclosure/2023/Oct/6 http://seclists.org/fulldisclosure/2023/Oct/8 http://seclists.org/fulldisclosure/2023/Oct/9 https://support.apple.com/en-us/HT213927 https://support.apple.com/en-us/HT213931 https://support.apple.com/en-us/HT213932 https://support.apple.com/en-us/HT213936 https://support.apple.com/en-us/HT213937