Hackers compromised the Polish airliner LOT with a DDoS ( distributed denial of service )attack.

Ten planes and 1,400 passengers were grounded because of the attack. The hackers compromised LOT's computer system which left it unable to send flight plans to the aircraft before takeoff. Without this document—which details the route, weather and other important information—the planes were not able to fly.

Although the issue only took 5 hours to resolve, it still left 10 flights cancelled and around 15 delayed at Warsaw Chopin airport. Planes in the air were not affected and no user data was compromised.

LOT spokesperson Adrian Kubicki said he was concerned because the system used by LOT is the same as other airlines and they could be open to the same attack.

David Emm, principal security researcher at Kaspersky Lab told CNBC: "This story highlights the fact that, as more and more aspects of our lives become cyber-dependent, we offer a greater attack surface to cybercriminals – including critical infrastructure systems."

Source: CNBC