Security Vulnerabilities Discovered in PureVPN's Linux Applications

A Linux security expert has identified critical security flaws in PureVPN's Linux applications that could compromise user privacy and system security.

The researcher, who goes by the name Anagogistis, revealed that both the GUI (version 2.10.0) and CLI (version 2.0.1) versions of PureVPN's Linux clients contain vulnerabilities that may expose users' data under certain conditions.

According to the detailed report published on September 17, these applications can potentially leak IPv6 traffic outside the encrypted VPN tunnel. These leaks typically occur following network transitions, such as when suspending or resuming an Ethernet connection or toggling Wi-Fi settings.

The implications of such leaks are significant, as they could allow websites and online services to identify users' actual locations and monitor their online activities—defeating the primary purpose of using a VPN service.

In addition to the IPv6 leaks, the security researcher discovered that the PureVPN Linux clients improperly handle system firewall configurations. When connecting, the applications override existing iptables rules but fail to restore the original settings upon disconnection. This leaves users with potentially weakened security protections compared to their pre-connection state.

After reportedly waiting over three weeks for a response from PureVPN, Anagogistis made his findings public. The VPN provider has since acknowledged the issues and committed to releasing patches by mid-October. They have also confirmed that these vulnerabilities are specific to the Linux platform and do not affect their applications on Windows, macOS, Android, or iOS.

While waiting for the official fixes, affected users are advised to implement several precautionary measures. These include manually disabling IPv6 at the system level, reapplying firewall rules after disconnecting from the VPN service, and prioritizing IPv4-only connections where possible.

PureVPN has acknowledged the seriousness of these security flaws and stated they are working to strengthen their internal processes to ensure faster acknowledgment and resolution of security issues in the future.

The testing that confirmed these vulnerabilities was conducted on Ubuntu 24.04.3 LTS running kernel 6.8 with iptables-nft backend, suggesting users on similar configurations should be particularly vigilant.

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