CVE-2021-30564
📋 TL;DR
This vulnerability allows remote attackers to trigger a heap buffer overflow in Chrome's WebXR implementation via a crafted HTML page. Attackers could potentially exploit heap corruption to execute arbitrary code or crash the browser. All users of 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 leading to full system compromise, data theft, or malware installation.
Likely Case
Browser crash (denial of service) or limited information disclosure from memory corruption.
If Mitigated
No impact if Chrome is updated to patched version or WebXR is disabled.
🎯 Exploit Status
Exploitation requires heap manipulation techniques but no authentication. No public exploits were reported at disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 91.0.4472.164 and later
Vendor Advisory: https://chromereleases.googleblog.com/2021/07/stable-channel-update-for-desktop.html
Restart Required: Yes
Instructions:
1. Open Chrome
2. Click menu (three dots) → Help → About Google Chrome
3. Chrome will automatically check for and install updates
4. Click 'Relaunch' to restart Chrome with the update
🔧 Temporary Workarounds
Disable WebXR
allDisable the WebXR API to prevent exploitation via this vector
chrome://flags/#webxr
Set 'WebXR Device API' to 'Disabled'
Relaunch Chrome
🧯 If You Can't Patch
- Use browser extensions to block JavaScript execution on untrusted sites
- Implement network filtering to block access to known malicious domains
🔍 How to Verify
Check if Vulnerable:
Check Chrome version: if below 91.0.4472.164, you are vulnerable.Check Version:
chrome://version/ (on Chrome) or 'google-chrome --version' (command line)Verify Fix Applied:
Confirm Chrome version is 91.0.4472.164 or higher.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports with WebXR-related stack traces
- Unexpected browser process termination
Network Indicators:
- HTTP requests to domains hosting WebXR content
- Unusual WebSocket connections to WebXR services
SIEM Query:
source="chrome_crash_reports" AND (process="chrome" OR process="browser") AND message="*WebXR*" OR "*heap corruption*"