The “TL;DR” summary of what follows below is: If you configure your IPsec based VPN properly, you are not affected. Always use Perfect Forward Secrecy (“pfs=yes” wich is the default in libreswan IPsec) and avoid PreSharedKeys (authby=secret which is not the default in libreswan IPsec). If you really need to use PSK, use a strong shared secret that cannot be brute forced. The NSA has their own version of IKEcrack running on millions of dollars worth of CPU’s. Also, the NSA sneaks into your router to steal your PSK’s so they can decrypt all your traffic.