Nord is a virtual private network that has been hacked recently. It was discovered and eventually accepted by Nord VPN that they had a breach.

A security researcher whose name was undefined made a post about  the "expired private keys" by Nord which had been leaked and exploited at some point in time, the Nord VPN acknowledged the error that had long been known to them and made several tweets to acknowledge the error.

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NordVPN Confirms It Was Hacked Due to Expired Private Keys

NordVPN Confirms It Was Hacked Due to Expired Private Keys
NordVPN Confirms It Was Hacked Due to Expired Private Keys
NordVPN usually switches servers every user is connected to every five minutes or so, but users choose which country to connect to. That means users may have been affected only by intervals. The violation could also have only affected users who were connecting through Finland, which is where the broken server was.

Nord also said that information taken from the server cannot be used to decrypt traffic to any other server. It acknowledges that the stolen encryption key, which has now expired, could have been used to carry out a man-in-the-middle attack, hiding as a NordVPN server. But NordVPN says such an attack will need to be personalized and complicated and applied to one person at a time.

Nord also reported that they had cut ties with the company that maintained the defective server after the incident became public.