CVE-2025-3066
📋 TL;DR
A use-after-free vulnerability in Chrome's Site Isolation feature allows remote attackers to potentially exploit heap corruption via a crafted HTML page. This could lead to arbitrary code execution or browser crashes. All users running vulnerable Chrome versions are affected.
💻 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 with the privileges of the Chrome process, potentially leading to full system compromise if combined with other vulnerabilities.
Likely Case
Browser crash (denial of service) or limited information disclosure through memory corruption.
If Mitigated
No impact if Chrome is fully patched or if exploit attempts are blocked by security controls.
🎯 Exploit Status
Use-after-free vulnerabilities typically require careful memory manipulation but can be reliably exploited with sufficient research.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 135.0.7049.84 and later
Vendor Advisory: https://chromereleases.googleblog.com/2025/04/stable-channel-update-for-desktop.html
Restart Required: Yes
Instructions:
Open Chrome
Click three-dot menu → Help → About Google Chrome
Allow Chrome to check for and install updates
Click 'Relaunch' when prompted
🔧 Temporary Workarounds
Disable Site Isolation (NOT RECOMMENDED)
allTemporarily disables the vulnerable component but reduces security against other attacks
chrome://flags/#site-isolation-trial-opt-out
Set to 'Opt-out' and restart
🧯 If You Can't Patch
- Restrict browsing to trusted websites only
- Use application control to block Chrome execution
🔍 How to Verify
Check if Vulnerable:
Check Chrome version in About Google Chrome page. If version is below 135.0.7049.84, system is vulnerable.Check Version:
On Windows: "chrome://version/" in address bar; On Linux/macOS: google-chrome --versionVerify Fix Applied:
Confirm Chrome version is 135.0.7049.84 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_logs" AND (event_type="crash" OR message="*access violation*" OR message="*heap corruption*")