Cisco

A former Cisco employee accessed the company's cloud infrastructure in 2018, five months after resigning, to deploy code that led to the shutdown of more than 16,000 WebEx Teams accounts and the deletion of 456 virtual machines.

30-year-old Sudhish Kasaba Ramesh accessed Cisco's cloud infrastructure hosted on Amazon Web Services without permission on September 24, 2018.

The shutdown forced Cisco to spend more than $2,400,000 in customer refunds and employee time needed to restore the damage caused by Ramesh.

Source: https://www.bleepingcomputer.com/news/security/cisco-engineer-resigns-then-nukes-16k-webex-accounts-456-vms/

"id": "CIS205918123",
"linkid": "cisco",
"type": "Breach",
"date": "04/2018",
"severity": "60",
"impact": "3",
"explanation": "Attack with significant impact with internal employee data leaks"