AirSnitch: Guest Network Isolation is a Myth

A recent study presented at the NDSS Symposium 2026 has unveiled AirSnitch, an attack that effectively bypasses Wi-Fi client isolation, commonly implemented in guest networks. Pentesting News highlighted Kaspersky’s detailed analysis of this vulnerability, which allows an attacker connected to a single wireless network via an access point to gain access to other devices on that same hardware, even if those devices are on entirely different SSIDs. This isn’t about cracking WPA2 or WPA3 encryption; it’s a clever exploit of how access points handle group keys and packet routing.

What’s particularly gnarly about AirSnitch is its ability to undermine the very concept of a guest network. If your guest and corporate networks share the same physical access point, an attacker can inject malicious traffic into neighboring SSIDs. In some scenarios, a full-blown man-in-the-middle (MitM) attack becomes a distinct possibility. This revelation underscores a critical flaw in traditional Wi-Fi isolation strategies, echoing past attacks like KRACK and FragAttacks that consistently challenge the industry’s evolving security protocols.