Bug allows hackers to inject malware onto any system if they manage to trick users into visiting booby-trapped websites. Anyone with IE 6 to 8 is potentially affected. The code to exploit the bug has already been published. Microsoft said there was no evidence it was being used yet by criminals but they are “investigating” and working on a permanent fix. The bug targets how the browser manages a computer’s memory when it is processing Cascade Style Sheets – which are design instructions that determine how most web pages look.
Source: https://thehackernews.com/2010/12/microsoft-warnings-about-flaw-inviting.html