A security vulnerability, now fixed, provided an opening for the attacker, the business-to-business arm of the mobile and telecom giant told KrebsoOnSecurity. The breach involved basic contact information, not propriety network information, the company told Krebs.
Prices of the customer data ranged from $10,000 to $100,000, Krebs reported.
Verizon, used by almost all Fortune 500 companies, is widely known for its cybersecurity prowess, and releases an annual report on avoiding cyberthreats, Krebs wrote.
Verizon told CNBC that impacted Verizon Enterprise customers are being notified, and no data about consumer customers was involved.
— CNBC's Ryan Ruggiero contributed to this report.