CVE-2025-0999
📋 TL;DR
A heap buffer overflow vulnerability in Chrome's V8 JavaScript engine allows remote attackers to potentially execute arbitrary code or cause denial of service via a crafted HTML page. This affects all users running vulnerable versions of Google Chrome and Chromium-based browsers. The vulnerability requires user interaction to visit a malicious website.
💻 Affected Systems
- Google Chrome
- Chromium
- Microsoft Edge (Chromium-based)
- Brave
- Opera
- Vivaldi
- other 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, data theft, or ransomware deployment.
Likely Case
Browser crash (denial of service) or limited memory corruption that could be leveraged for information disclosure or sandbox escape in combination with other vulnerabilities.
If Mitigated
Browser crash with no further impact if sandboxing holds, though repeated crashes could disrupt user productivity.
🎯 Exploit Status
Exploitation requires user to visit a malicious website. No authentication is needed beyond user interaction. Heap corruption vulnerabilities typically require precise memory manipulation to achieve reliable exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 133.0.6943.126 and later
Vendor Advisory: https://chromereleases.googleblog.com/2025/02/stable-channel-update-for-desktop_18.html
Restart Required: No
Instructions:
1. Open Chrome. 2. Click the three-dot menu > Help > About Google Chrome. 3. Chrome will automatically check for updates and install version 133.0.6943.126 or later. 4. Relaunch Chrome if prompted.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents execution of malicious JavaScript that could trigger the vulnerability, but breaks most website functionality.
chrome://settings/content/javascript > toggle to 'Blocked'
🧯 If You Can't Patch
- Deploy network filtering to block known malicious domains and restrict browser access to untrusted websites.
- Use application allowlisting to prevent execution of unauthorized browser versions and implement browser isolation solutions.
🔍 How to Verify
Check if Vulnerable:
Check Chrome version via chrome://settings/help or 'About Google Chrome'. If version is below 133.0.6943.126, the system is vulnerable.Check Version:
On Windows: "C:\Program Files\Google\Chrome\Application\chrome.exe" --version
On macOS: /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version
On Linux: google-chrome --versionVerify Fix Applied:
Confirm Chrome version is 133.0.6943.126 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Chrome crash reports in Windows Event Log (Event ID 1000) or macOS Console
- Unexpected browser termination logs
- Sandbox escape attempts in security logs
Network Indicators:
- HTTP requests to domains hosting exploit code
- Unusual outbound connections from Chrome process post-crash
SIEM Query:
source="chrome_crash_logs" AND (message="V8" OR message="heap") AND severity=HIGH