Apple's iOS version 13.3.1 and likely all newer versions contain a vulnerability that prevents any VPN from encrypting all traffic.
Until Apple fixes the problem, please use the following solution to mitigate the issue.
How to mitigate the iOS vulnerability
Internet connections that are established after connecting to a VPN are unaffected, but connections that are already running are at risk.
To ensure that all of your traffic is secure, do the following:
- Connect to Mullvad VPN.
- Enable Airplane Mode.
- Turn off Wi-Fi if it’s on.
- Disable Airplane Mode.