CVE-2025-43209

Description

An out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in iOS 18.6 and iPadOS 18.6, iPadOS 17.7.9, macOS Sequoia 15.6, macOS Sonoma 14.7.7, macOS Ventura 13.7.7, tvOS 18.6, visionOS 2.6, watchOS 11.6. Processing maliciously crafted web content may lead to an unexpected Safari crash.

CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
apple	ipados	< 17.7.9
apple	ipados	18.0 — 18.6
apple	iphone_os	< 18.6
apple	macos	< 13.7.7
apple	macos	14.0 — 14.7.7
apple	macos	15.0 — 15.6
apple	tvos	< 18.6
apple	visionos	< 2.6
apple	watchos	< 11.6

References

Advisories & Patches

https://support.apple.com/en-us/124147 https://support.apple.com/en-us/124148 https://support.apple.com/en-us/124149 https://support.apple.com/en-us/124150 https://support.apple.com/en-us/124151 https://support.apple.com/en-us/124153 https://support.apple.com/en-us/124154 https://support.apple.com/en-us/124155

Other References

http://seclists.org/fulldisclosure/2025/Jul/31 http://seclists.org/fulldisclosure/2025/Jul/32 http://seclists.org/fulldisclosure/2025/Jul/33 http://seclists.org/fulldisclosure/2025/Jul/34 http://seclists.org/fulldisclosure/2025/Jul/36 http://seclists.org/fulldisclosure/2025/Jul/37

Frequently Asked Questions

What is CVE-2025-43209? +

An out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in iOS 18.6 and iPadOS 18.6, iPadOS 17.7.9, macOS Sequoia 15.6, macOS Sonoma 14.7.7, macOS Ventura 13.7.7, tvOS 18.6, visionOS 2.6, watchOS 11.6. Processing maliciously crafted web content may lead to an unexpected Safari crash. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-43209? +

CVE-2025-43209 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-43209? +

CVE-2025-43209 affects products from apple, specifically: ipados, iphone_os, macos, tvos, visionos, watchos. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-43209? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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