ExpressVPN has removed the split tunneling feature from the latest version of its software after finding that a bug exposed the domains users were visiting to configured DNS servers.
However, this bug caused some DNS queries to be sent to the DNS server configured on the computer, usually a server at the user's ISP, allowing the server to track a user's browsing habits.
The bug was introduced in ExpressVPN Windows versions 12.23.1 – 12.72.0, published between May 19, 2022, and Feb. 7, 2024, and only affected those using the split tunneling feature.