CVE-2023-32439 – This is a type confusion vulnerability in Apple... (How to Fix)

Q: What is the severity of CVE-2023-32439?

CVE-2023-32439 has a CVSS score of 8.8 (HIGH). This is a type confusion vulnerability in Apple's WebKit browser engine that allows processing malicious web content to execute arbitrary code. It affects iOS, iPadOS, macOS, and Safari users. Apple has confirmed this vulnerability was actively exploited in the wild.

📋 TL;DR

This is a type confusion vulnerability in Apple's WebKit browser engine that allows processing malicious web content to execute arbitrary code. It affects iOS, iPadOS, macOS, and Safari users. Apple has confirmed this vulnerability was actively exploited in the wild.

💻 Affected Systems

Products:

iOS
iPadOS
macOS
Safari

Versions: iOS/iPadOS before 16.5.1 and 15.7.7, macOS Ventura before 13.4.1, Safari before 16.5.1

Operating Systems: iOS, iPadOS, macOS

Default Config Vulnerable: ⚠️ Yes

Notes: All devices using affected versions of WebKit are vulnerable when browsing the web.

📦 What is this software?

Macos by Apple

macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...

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Safari by Apple

View all CVEs affecting Safari →

Webkitgtk by Webkitgtk

View all CVEs affecting Webkitgtk →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise through remote code execution, allowing attackers to install malware, steal data, or create persistent backdoors.

🟠

Likely Case

Targeted attacks against specific users via malicious websites or links leading to device compromise and data theft.

🟢

If Mitigated

No impact if systems are fully patched with the latest Apple updates.

🌐 Internet-Facing: HIGH - Exploitable through web browsing without user interaction beyond visiting a malicious site.

🏢 Internal Only: MEDIUM - Could be exploited through internal phishing campaigns or compromised internal websites.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: CONFIRMED

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Apple confirmed active exploitation in the wild. Exploitation requires user to visit malicious website but no authentication needed.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: iOS 16.5.1, iPadOS 16.5.1, iOS 15.7.7, iPadOS 15.7.7, macOS Ventura 13.4.1, Safari 16.5.1

Vendor Advisory: https://support.apple.com/en-us/HT213811

Restart Required: Yes

Instructions:

1. Go to Settings > General > Software Update on iOS/iPadOS. 2. For macOS, go to System Settings > General > Software Update. 3. Install available updates immediately. 4. Restart device after installation.

🔧 Temporary Workarounds

Disable JavaScript

all

Temporarily disable JavaScript in Safari to prevent exploitation through web content

Safari > Settings > Security > uncheck 'Enable JavaScript'

Use Alternative Browser

all

Use browsers not based on WebKit until systems can be patched

🧯 If You Can't Patch

Implement web filtering to block known malicious domains and suspicious JavaScript content
Enable application whitelisting to prevent unauthorized code execution

🔍 How to Verify

Check if Vulnerable:

Check current OS version in Settings > General > About on iOS/iPadOS or About This Mac on macOS

Check Version:

iOS/iPadOS: Settings > General > About > Version; macOS: About This Mac > macOS version; Safari: Safari > About Safari

Verify Fix Applied:

Verify OS version matches or exceeds patched versions: iOS/iPadOS 16.5.1 or 15.7.7, macOS 13.4.1, Safari 16.5.1

📡 Detection & Monitoring

Log Indicators:

Unusual Safari/WebKit process crashes
Suspicious JavaScript execution patterns
Unexpected network connections from browser processes

Network Indicators:

Connections to known malicious domains from Apple devices
Unusual outbound traffic patterns from web browsers

SIEM Query:

source="apple-device-logs" AND (process="Safari" OR process="WebKit") AND event="crash" OR source="network-logs" AND dest_ip IN (malicious_ip_list) AND src_process="Safari"

📊 Metadata

CVE ID: CVE-2023-32439

CVSS v3 Score: 8.8 (HIGH)

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

CWE: CWE-843

Published: June 23, 2023

Last Updated: October 23, 2025

🔗 References

https://security.gentoo.org/glsa/202401-04 Third Party Advisory
https://support.apple.com/en-us/HT213811 Release Notes,Vendor Advisory
https://support.apple.com/en-us/HT213813 Release Notes,Vendor Advisory
https://support.apple.com/en-us/HT213814 Release Notes,Vendor Advisory
https://support.apple.com/en-us/HT213816 Release Notes,Vendor Advisory
https://support.apple.com/kb/HT213814 Vendor Advisory
https://support.apple.com/kb/HT213816 Vendor Advisory
https://security.gentoo.org/glsa/202401-04 Third Party Advisory
https://support.apple.com/en-us/HT213811 Release Notes,Vendor Advisory
https://support.apple.com/en-us/HT213813 Release Notes,Vendor Advisory
https://support.apple.com/en-us/HT213814 Release Notes,Vendor Advisory
https://support.apple.com/en-us/HT213816 Release Notes,Vendor Advisory
https://support.apple.com/kb/HT213814 Vendor Advisory
https://support.apple.com/kb/HT213816 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-32439 US Government Resource

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