CVE-2020-16009

This is a weakness in the JavaScript engine inside your browser. A malicious website can be crafted to damage memory (heap corruption) when a user simply opens a page, which can lead to the browser/app being controlled or crashing. Think of it like a bad “document format” that can break the reader and, in the worst case, let an attacker take control of what the reader is doing.

This matters if you run Google Chrome or Microsoft Edge/Edge Chromium that is older than the fixed versions, or if your company uses an application that embeds Chromium via CefSharp. The attack typically requires a user to visit/open a malicious web page while the vulnerable software is running. Real-world risk is highest when your environment allows users to browse the web (or receive links) and those devices are still on vulnerable versions.

This is RED because CISA KEV confirms this vulnerability was exploited in the real world, and it allows attackers to target users through a crafted web page. There is public exploit availability, so relying on luck or “it hasn’t happened yet” is not a safe plan. Update the affected browsers and CefSharp-based apps immediately to the fixed versions.