CVE-2025-9479
📋 TL;DR
An out-of-bounds read vulnerability in Chrome's V8 JavaScript engine allows remote attackers to potentially exploit heap corruption via malicious HTML pages. This affects all users running Chrome versions before 133.0.6943.141. Attackers could execute arbitrary code or cause browser crashes.
💻 Affected Systems
- Google Chrome
- Chromium-based browsers
📦 What is this software?
Chrome by Google
Google Chrome is the world's most popular web browser, used by over 3 billion users globally across Windows, macOS, Linux, Android, and iOS platforms. As a Chromium-based browser developed by Google, Chrome dominates the browser market with approximately 65% market share, making it a critical compon...
Learn more about Chrome →⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, data theft, or malware installation via browser exploitation.
Likely Case
Browser crash (denial of service) or limited information disclosure from memory reads.
If Mitigated
No impact if Chrome is updated to patched version or if exploit attempts are blocked by security controls.
🎯 Exploit Status
Exploitation requires user to visit malicious webpage. No authentication required for initial access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 133.0.6943.141
Vendor Advisory: https://chromereleases.googleblog.com/2025/02/stable-channel-update-for-desktop_25.html
Restart Required: Yes
Instructions:
Open Chrome
Click three-dot menu → Help → About Google Chrome
Chrome will automatically check for and install update
Click 'Relaunch' when prompted
🔧 Temporary Workarounds
Disable JavaScript
allPrevents exploitation by disabling JavaScript execution in Chrome
chrome://settings/content/javascript → Block
Use Site Isolation
allEnables site isolation to limit impact of successful exploitation
chrome://flags/#enable-site-per-process → Enable
🧯 If You Can't Patch
- Deploy web proxy/content filter to block malicious sites
- Use application allowlisting to restrict Chrome usage to essential personnel only
🔍 How to Verify
Check if Vulnerable:
Check Chrome version in About Google Chrome page. If version is below 133.0.6943.141, system is vulnerable.Check Version:
google-chrome --versionVerify Fix Applied:
Confirm Chrome version is 133.0.6943.141 or higher in About Google Chrome page.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports
- Unexpected process termination events
- Memory access violation logs
Network Indicators:
- Requests to known malicious domains hosting exploit code
- Unusual outbound connections from Chrome processes
SIEM Query:
source="chrome" AND (event_type="crash" OR message="*out of bounds*" OR message="*heap corruption*")