I tried OpenSnitch but it would always randomly crash while interacting with the GUI, and it would reset all my tcp connections every time you start it back up.

Copying my reply from another thread:

This link should be working.

Quoting from the OP tweet:

* Unauthenticated RCE vs all GNU/Linux systems (plus others) disclosed 3 weeks ago.
* Full disclosure happening in less than 2 weeks (as agreed with devs).
* Still no CVE assigned (there should be at least 3, possibly 4, ideally 6).
* Still no working fix.
* Canonical, RedHat and others have confirmed the severity, a 9.9, check screenshot.
* Devs are still arguing about whether or not some of the issues have a security impact.

I’ve spent the last 3 weeks of my sabbatical working full time on this research, reporting, coordination and so on with the sole purpose of helping and pretty much only got patronized because the devs just can’t accept that their code is crap - responsible disclosure: no more.

The Twitter account has been privated and there are no news stories about it. Other communities where this has been shared are reasonably suspicious.