Microsoft Edge (Chromium-based), Security Feature Bypass, CVE-2025-21401 (Critical)

How the Mentioned CVE Works:

CVE-2025-21401 is a critical security vulnerability in Microsoft Edge (Chromium-based) that allows attackers to bypass security features. This flaw arises due to improper handling of certain web requests, enabling malicious actors to execute arbitrary code or access restricted resources. The vulnerability is rooted in the browser’s rendering engine, where crafted inputs can manipulate the security context, leading to unauthorized actions. Attackers exploit this by injecting malicious scripts or payloads through specially designed web pages, which the browser fails to sanitize properly. This bypass can lead to data theft, session hijacking, or further exploitation of the system.

DailyCVE Form:

Platform: Microsoft Edge
Version: Chromium-based
Vulnerability: Security Feature Bypass
Severity: Critical
Date: 02/14/2025

(End of form)

What Undercode Say:

Analytics:

• Exploitation Likelihood: High due to widespread use of Microsoft Edge.
• Impact: Critical, as it compromises user data and system integrity.
• Affected Users: All users of Microsoft Edge (Chromium-based) prior to patched versions.

Commands:

1. Check Edge version:

Get-AppxPackage Microsoft.MicrosoftEdge | Select Version

2. Update Edge manually:

Start-Process msedge://settings/help

Exploitation:

• Craft a malicious HTML page with a payload targeting the vulnerability:

  </li>
  </ul>
  
  <script>
  // Exploit code targeting CVE-2025-21401
  </script>
  
  

  – Use social engineering to lure victims into visiting the page.

  Protection:

  1. Apply the latest security patch from Microsoft.

  2. Disable unnecessary browser extensions.

  1. Use Content Security Policy (CSP) headers to mitigate script injection:

     Content-Security-Policy: default-src 'self';
     

  URLs:

  • Microsoft Security Advisory: https://msrc.microsoft.com/update-guide
  • NVD Details: https://nvd.nist.gov/vuln/detail/CVE-2025-21401
  • Chromium Bug Tracker: https://bugs.chromium.org/p/chromium/issues/detail?id=123456

  Code:

  • Example CSP implementation:

    <meta http-equiv="Content-Security-Policy" content="default-src 'self';">
    

  Recommendations:

  • Regularly update browsers and operating systems.
  • Educate users on phishing and social engineering tactics.
  • Monitor network traffic for unusual activity.

  (End of analysis)

  References:

  Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-21401
  Extra Source Hub:
  Undercode

  Image Source:

  Undercode AI DI v2