Verizon Communications Inc said an attacker hacked into its enterprise client portal and stole contact information of a number of customers, CNBC reported.
Krebs On Security, which first broke the news of the breach, said a member of a underground cybercrime forum had posted a new thread advertising the sale of a database containing the contact information on some 1.5 million customers of Verizon Enterprise.
Verizon said the attacker did not gain access to Customer Proprietary Network Information (CPNI) or other data. CPNI is the information that telephone companies collect including the time, date and duration of each call and the type of network a consumer subscribes to.
The company is notifying customers impacted by the breach.