"There were attempts to steal COVID vaccine and treatment technology during cyber attacks and Pfizer was hacked," said Ha Tae-keung, a member of South Korea's parliamentary intelligence committee, according to Reuters. It's unclear when the hack occurred or whether it was successful.
Pfizer didn't immediately respond to a request for comment.
In December, The Wall Street Journal reported that North Korean hackers had targeted at least six pharmaceutical companies in the US, the UK and South Korea that have been working on vaccines. Distributors and suppliers have also been the looking to steal information on COVID-19 vaccines.
Pfizer's vaccine, which was developed with German partner BioNTech, wasin the US in December. It's being administered along with a vaccine developed by Moderna. Last week, President Joe Biden said the US had , adding that enough supply has now been purchased to vaccinate all Americans.