Researchers Demonstrate AirSnitch Attacks That Bypass Wi-Fi Client Isolation

Feb 26, 2026 · Original article ↗

Summary

Researchers say AirSnitch exploits Layer 1/2 identity desynchronization to bypass Wi-Fi client isolation—not break Wi-Fi encryption—enabling bidirectional interception on tested routers. An attacker needs some network access.

Key points

AirSnitch exploits how Wi-Fi access points map clients across network layers, bypassing client isolation without breaking Wi-Fi authentication or encryption.
The described port-stealing technique can redirect a victim’s traffic to an attacker; repeated MAC-address remapping enables bidirectional man-in-the-middle interception.
Attacks may work across different SSIDs and, in some setups, across access points connected to the same wired distribution system.
Interception can expose or modify unencrypted traffic and enable attacks such as DNS cache poisoning; HTTPS still encrypts page content.
Researchers describe a RADIUS attack that can expose uplink packets and potentially enable a rogue RADIUS server and access point.
All 11 tested routers or router platforms were vulnerable to at least one attack. The researchers said some vendors had released updates mitigating some attacks, with more expected.
VPNs and wireless VLANs may provide limited mitigation; the article advises caution on unfamiliar Wi-Fi and, when feasible, tethering through a phone.

Article Details

Attack Vectors: AirSnitch exploits cross-layer identity desynchronization between Layers 1 and 2 and higher network layers to bypass Wi-Fi client isolation.
Port stealing: an attacker spoofs a victim’s MAC address on another network interface and completes a Wi-Fi four-way handshake, causing the access point or switch to forward the victim’s downlink traffic to the attacker.
The attacker can send an ICMP ping from a random MAC, wrapped in the shared Group Temporal Key, to restore the original Layer-1 mapping and support bidirectional interception.
The researchers report that the attacks can operate across different SSIDs or network segments sharing an access point, and across access points connected to a common distribution system.
With bidirectional interception, an attacker can view or modify traffic, including plaintext data, and may intercept uplink RADIUS packets. The researchers describe setting up a rogue RADIUS server and associated rogue WPA2/3 access point as a possible follow-on.
Defensive Notes: The article says some router makers have released updates that mitigate some attacks; check for and apply available updates. It also reports that some systemic weaknesses may require changes to underlying chips.
Use a trustworthy VPN on public access points, while recognizing that VPNs may leak metadata, DNS queries, or other traffic.
Wireless VLANs may help isolate SSIDs but are not universally available and can be misconfigured or permit hopping vulnerabilities.
The article identifies zero-trust practices as a potential mitigation, while noting adoption can be challenging.
For networks managed by people you do not know, exercise caution; when feasible, tether through a cell phone instead of using the Wi-Fi network.