> Are there known exploits based on web browser use, which are foiled by CPU microcode changes? Or, are these speculated to be possible? The exploit certainly

> Are there known exploits based on web browser use, which are foiled by CPU microcode changes? Or, are these speculated to be possible? The exploit certainly was possible: https://security.googleblog.com/2021/03/a-spectre-proof-of-concept-for-spectre.html https://security.googleblog.com/2021/03/a-spectre-proof-of-c... To what degree it's mitigated by CPU microcode patches or browser changes, I couldn't say off the top of my head. I suspect the situation has improved on both fronts.