⚠️ Critical Zero-Day Alert • CVE-2025-11205

      CRITICAL: Chrome 141 Update Fixes High-Severity Flaws (CVE-2025-11205/6). Patch NOW to Prevent Remote Access!    

By CyberDudeBivash • October 02, 2025 • Urgent Security Advisory

 cyberdudebivash.com |       cyberbivash.blogspot.com 

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Disclosure: This is a public service security advisory. It contains affiliate links to security solutions that provide defense-in-depth against web-based threats. Your support helps fund our independent research.

 Threat Report: Table of Contents 

1. Chapter 1: The Zero-Day — Deep Dive into the Two Critical Flaws
2. Chapter 2: The Kill Chain — How a Malicious Website Leads to Remote Access
3. Chapter 3: The Defender’s Playbook — How to Update Chrome NOW (The Only Fix)
4. Chapter 4: The Strategic Response — Why Browser Security Is Endpoint Security

 CyberDudeBivash’s Recommended Defense Kit:  Endpoint Protection (Kaspersky) •   Cybersecurity Courses (Edureka) •   Secure Hardware & Appliances (Alibaba) •   Security Tools & Lab Gear (AliExpress)

Chapter 1: The Zero-Day — Deep Dive into the Two Critical Flaws

Google has confirmed that at least one of the vulnerabilities fixed in this update, CVE-2025-11205, is being actively exploited in the wild. This makes patching an emergency priority.

CVE-2025-11205: Use-After-Free in WebRTC (Actively Exploited)

This is the most severe flaw. WebRTC is the component that enables real-time communication (voice, video) in the browser. This Use-After-Free (UAF) vulnerability allows a malicious website to trigger a memory corruption error by sending a specially crafted data packet during the setup of a WebRTC connection. At a minimum, this will crash the browser tab or the entire browser. For a skilled attacker, however, this memory corruption can be controlled to achieve Remote Code Execution (RCE) inside the browser’s sandbox.

CVE-2025-11206: Heap Buffer Overflow in Skia

Skia is the 2D graphics engine Chrome uses to render webpages. This high-severity flaw is a heap buffer overflow that can be triggered by a malicious website displaying a specially crafted image or font. Similar to the WebRTC flaw, this can lead to a browser crash and a potential RCE scenario.

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Chapter 2: The Kill Chain — How a Malicious Website Leads to Remote Access

The attack is a classic web-based compromise, often referred to as a “drive-by” attack.

1. The Lure:** The victim is lured to a malicious website. This can happen via a phishing email, a malicious ad (malvertising), or by compromising a legitimate website and injecting a redirect (a “watering hole” attack).
2. Exploitation:** The malicious landing page contains the exploit code. It fingerprints the victim’s browser to confirm it is a vulnerable version of Chrome. It then triggers one of the flaws, like the UAF in WebRTC, to gain initial code execution within the browser’s sandboxed process.
3. Sandbox Escape:** The attacker’s initial shellcode then triggers a second vulnerability, often in the underlying OS kernel, to “escape” the browser’s sandbox and gain full control over the user’s computer.
4. **Payload Delivery:** With full access, the attacker downloads and executes their final payload, which could be an infostealer, a Remote Access Trojan (RAT), or a ransomware loader.

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Chapter 3: The Defender’s Playbook — How to Update Chrome NOW (The Only Fix)

You must take action immediately. The process is simple, but the final step is critical.

Step 1: Open the “About Google Chrome” Page

Click the three vertical dots in the top-right corner of Chrome. Navigate to Help > About Google Chrome. (Alternatively, type chrome://settings/help in your address bar and press Enter).

Step 2: Download the Update

The “About” page will automatically check for updates and start downloading the new, secure version.

Step 3: RELAUNCH!

A **”Relaunch”** button will appear once the download is complete. Your browser is **NOT protected** until you click this button and restart Chrome. Simply closing and reopening windows is not enough. The update is only applied upon relaunch.

 Defense-in-Depth Tip: A browser patch is essential, but a strong security suite can block the malicious website from ever loading.     Kaspersky’s Safe Browsing provides a critical first line of defense.  

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Chapter 4: The Strategic Response — Why Browser Security Is Endpoint Security

This incident is another powerful reminder that for most users, the browser *is* the operating system. It is the primary gateway for all external data and the main target for attackers. A security strategy that relies solely on the browser’s built-in defenses is incomplete.

A mature security posture for endpoints requires a **Defense-in-Depth** model:

• Prompt Patching:** An organizational policy to rapidly deploy critical browser updates.
• **Web Filtering:** A network or endpoint-based tool to block access to known malicious domains.
• Endpoint Detection & Response (EDR):** A last line of defense. If the browser is compromised, the EDR is your only tool to detect the malicious activity that happens next, as we detail in our **Ultimate Guide to EDR**.

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• The Single-Click Attack Chain Explained
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About the Author

CyberDudeBivash is a cybersecurity strategist with 15+ years in exploit analysis, browser security, and incident response, advising CISOs across APAC. [Last Updated: October 02, 2025]

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