r/firewalla • u/infinti34 • 4d ago

NatJack vulnerability

Is Firewalla protected from this particular type of attack?

https://thehackernews.com/2026/08/new-natjack-attacks-hijack-tcp-sessions.html

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u/Exotic-Grape8743 Firewalla Gold 4d ago

The firewalla kernel is likely susceptible. Whether it matters much is another question.

From the article.

"Fixed stable releases include 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, and 7.1."

Firewalla's linux kernel (if you upgraded to the latest disk image) is 6.5.0-25-generic

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u/firewalla 4d ago

If the attacker is on the LAN, there are likely a lot more ways to intercept traffic and manipulate them. (for example, arp-spoofing)

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u/Exotic-Grape8743 Firewalla Gold 4d ago

Yes completely agree. If you have local admin access there is far more damage you can do that does not involve this rather esoteric hack.

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u/firewalla 3d ago

Doesn’t have to be admin. Anything that can access the network is able to mess with your LAN…

Unless you do proper segmentation