NEW YORK (CNNMoney) — Citigroup acknowledged that a hack attack last month stole millions of dollars from customers’ credit card accounts.
Citigroup told CNN that about $2.7 million was stolen from about 3,400 accounts on May 10.
The hackers actually accessed a much greater number of accounts: 360,083. So the thefts applied to less than 1% of the hacked accounts, according to Citigroup.
The bank reiterated that customers will not be responsible from financial losses stemming from the attacks.
“Customers are not liable for any fraud on the accounts and are 100% protected,” the bank said.
Citigroup announced on June 16 that more than 200,000 new credit cards had been issued to hacked customers. In some cases, customers had already closed their account or had received a new credit card, so they didn’t need the Citi-mandated replacement.
Citigroup said that it had waited until June 3, more than three weeks after the discovery, to start sending out notification letters. However, the company insisted that it acted quickly to deal with the security problem
“From the moment Citi discovered the breach, we took immediate action to rectify the situation and protect any customers potentially at risk,” said Citi, in a statement earlier this month.
There have been other recent high-profile security breaches. Video game maker Electronic Arts reported, on Friday, said that hackers recently breached a server linked to a message board, stealing customer information.
Sony was subjected to major hacks in April and May, affecting several of its gaming systems and potentially compromising tens of millions of credit card numbers.
In a separate case, hackers used SecurIDs — the tokens used by office workers to access corporate systems — to launch cyber attacks against Lockheed Martin. The maker of the tokens, RSA Security, a division of EMC Corp., offered to replace or monitor all SecurIDs.
Bank of America employees and some clients use the tokens. The banks said they will be replaced.
— CNN’s Nina Golgowski contributed to this story
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