Cisco Investigates Security Breach Involving High-Profile Companies, Verizon's Call Logs

Cisco Systems Inc. is investigating a security breach after hackers claimed to have stolen data from high-profile companies such as Verizon, AT&T, Bank of America, Microsoft, and Chevron. The compromised data reportedly includes source code, confidential documents, API tokens, SSL certificates, and Verizon's push-to-talk call logs. The stolen information was advertised for sale on a Russian-language crime forum. Cisco confirmed that an investigation is ongoing, while the company's stock moved lower amid the news.