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It's not macOS firewall, but Apple's implementation of OpenBSD's pf used in Apple's macOS. Mullvad is clearly pointing at a bug in OpenBSD's "packet filter", mentioning that it's used in macOS.

Mullvad's article lacks proper wording and shits on the wrong target.

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There isn't any mention of OpenBSD in the article. It says:

> a bug in the macOS firewall, packet filter (PF)

> We believe the firewall bugs must be fixed by Apple.

I don't see how you can interpret that as shitting on OpenBSD.

Or maybe they're not shitting on anyone in particular and just trying to warn their MacOS users about a security issue?

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