CVE-2024-27833 – This CVE describes an integer overflow vulnerab... (How to Fix)

Q: What is the severity of CVE-2024-27833?

CVE-2024-27833 has a CVSS score of 8.8 (HIGH). This CVE describes an integer overflow vulnerability in Apple's WebKit browser engine that could allow arbitrary code execution when processing malicious web content. It affects multiple Apple operating systems and Safari browser versions. Users of affected Apple devices and Safari browsers are at risk.

📋 TL;DR

This CVE describes an integer overflow vulnerability in Apple's WebKit browser engine that could allow arbitrary code execution when processing malicious web content. It affects multiple Apple operating systems and Safari browser versions. Users of affected Apple devices and Safari browsers are at risk.

💻 Affected Systems

Products:

tvOS
iOS
iPadOS
visionOS
Safari

Versions: Versions prior to tvOS 17.5, iOS 16.7.8, iPadOS 16.7.8, visionOS 1.2, Safari 17.5, iOS 17.5, iPadOS 17.5

Operating Systems: Apple tvOS, Apple iOS, Apple iPadOS, Apple visionOS, macOS (via Safari)

Default Config Vulnerable: ⚠️ Yes

Notes: All default configurations of affected Apple devices and Safari browsers are vulnerable.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise via remote code execution leading to data theft, ransomware deployment, or persistent backdoor installation.

🟠

Likely Case

Browser compromise leading to session hijacking, credential theft, or malware download when visiting malicious websites.

🟢

If Mitigated

Limited impact with proper network segmentation, application sandboxing, and up-to-date security software.

🌐 Internet-Facing: HIGH - Exploitable via malicious web content accessible from internet-facing systems.

🏢 Internal Only: MEDIUM - Requires user interaction with malicious content but could spread internally via phishing or compromised internal sites.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires user to visit malicious website but no authentication needed. No public exploit code identified in references.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: tvOS 17.5, iOS 16.7.8, iPadOS 16.7.8, visionOS 1.2, Safari 17.5, iOS 17.5, iPadOS 17.5

Vendor Advisory: https://support.apple.com/en-us/HT214100

Restart Required: Yes

Instructions:

1. Open Settings app. 2. Navigate to General > Software Update. 3. Install available updates. 4. Restart device when prompted. For Safari on macOS: 1. Open App Store. 2. Click Updates tab. 3. Install Safari update. 4. Restart browser.

🔧 Temporary Workarounds

Browser Content Restrictions

all

Disable JavaScript execution in Safari settings to prevent exploitation via web content.

Network Filtering

all

Block known malicious domains and implement web content filtering at network perimeter.

🧯 If You Can't Patch

Implement strict web content filtering and block access to untrusted websites
Use alternative browsers temporarily and restrict Safari usage to trusted sites only

🔍 How to Verify

Check if Vulnerable:

Check device version in Settings > General > About > Software Version. Compare against patched versions listed in affected_systems.

Check Version:

iOS/iPadOS/tvOS/visionOS: Settings > General > About > Software Version. Safari: Safari menu > About Safari.

Verify Fix Applied:

Verify software version matches or exceeds patched versions after update installation.

📡 Detection & Monitoring

Log Indicators:

Unusual Safari/WebKit process crashes
Suspicious JavaScript execution patterns
Memory allocation errors in system logs

Network Indicators:

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

SIEM Query:

source="apple-device-logs" AND (process="Safari" OR process="WebKit") AND (event="crash" OR event="memory_error")

📊 Metadata

CVE ID: CVE-2024-27833

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-190

Published: June 10, 2024

Last Updated: November 4, 2025

🔗 References

http://seclists.org/fulldisclosure/2024/Jun/5 Mailing List,Third Party Advisory
https://support.apple.com/en-us/HT214100 Vendor Advisory
https://support.apple.com/en-us/HT214101 Vendor Advisory
https://support.apple.com/en-us/HT214102 Vendor Advisory
https://support.apple.com/en-us/HT214103 Vendor Advisory
https://support.apple.com/en-us/HT214108 Vendor Advisory
http://seclists.org/fulldisclosure/2024/Jun/5 Mailing List,Third Party Advisory
https://support.apple.com/en-us/HT214100 Vendor Advisory
https://support.apple.com/en-us/HT214101 Vendor Advisory
https://support.apple.com/en-us/HT214102 Vendor Advisory
https://support.apple.com/en-us/HT214103 Vendor Advisory
https://support.apple.com/en-us/HT214108 Vendor Advisory
https://support.apple.com/kb/HT214100
https://support.apple.com/kb/HT214102
https://support.apple.com/kb/HT214103
https://support.apple.com/kb/HT214108

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