Public Wi-Fi threat model illustration
Public Wi-Fi · 2026 threat model · original checklist

Public Wi-Fi threat model (2026)

“Just use a VPN” is incomplete advice. This page models who can hurt you on open Wi-Fi, which controls actually change the outcome, and when you should refuse the network entirely. It is written for travelers, remote workers, and anyone who habitually joins “Free_Airport” without reading the SSID twice.

Disclosure: wordok.top publishes VPN educational pillars and a USA VPN 2026 scorecard. We also ship browser-local image tools (EXIF Strip, Watermark). This checklist is hygiene guidance, not a penetration-test report.

Assets you are protecting

Threat actors (keep them separate)

ActorTypical moveWhat helps
Opportunistic peer on same LAN Port scans, SMB probes, mDNS noise OS firewall, client isolation (hope), VPN full tunnel
Evil-twin / fake portal Lookalike SSID; harvest passwords Verify SSID with staff; never reuse hotel portal passwords elsewhere; MFA
Local passive observer Sniff open or weakly segmented traffic HTTPS everywhere + VPN encryption on the path
Phishing site after you are “online” Malicious ads / typosquat Not a VPN job — browser hygiene, password manager, MFA

Control stack (ordered)

  1. Identity the network — ask front desk for the exact SSID; watch for “HotelGuest_Free” twins.
  2. Captive portal first — complete login so the gateway routes you; then enable VPN.
  3. Kill switch on — if the tunnel drops, traffic should not silently fall back to clearnet. See our privacy best practices.
  4. Leak check — after connect, confirm DNS / WebRTC expectations with a trusted leak test page.
  5. Task triage — postpone banking and password resets if the network feels wrong; use phone cellular for those.
  6. Share-later hygiene — strip EXIF before posting travel photos (photo privacy checklist).

Café vs hotel vs airport

What a VPN does not fix

Endpoint malware, fake apps, shoulder surfing, and “I reused my email password on the portal” are outside the tunnel. If your threat model is a nation-state or a targeted stalker, public Wi-Fi plus a consumer VPN is the wrong primary control — reduce exposure instead.

wordok.top related pages

FAQ

Is a VPN enough on café Wi-Fi?

It helps for path encryption and IP masking; it is not a complete security program. Keep MFA and phishing awareness.

VPN before or after captive portal?

Usually portal first, then VPN + kill switch. Providers differ — test once on a low-stakes site.

What should I never do on open Wi-Fi?

Password resets, payroll, banking, and ID uploads. Use cellular or wait for a trusted network.