Cisco: Hacker breached multifactor authentication message provider on April 1
Cisco said one of the providers it uses to send multifactor authentication (MFA) messages was breached by a threat actor on April 1. In emails to customers, Cisco said the incident specifically affected Duo — a multifactor authentication company it acquired in 2018. The attacker breached the system of a telephony supplier that Duo uses to send MFA messages through texts and phone calls to its customers.
