The 2021 Report: Breach Exposure of the Fortune 1000 provides an overview of the security risks faced by large enterprises. The report reveals that many Fortune 1000 companies have experienced a breach exposure, with corporate credentials being the most common target. Password reuse is a major concern, with certain sectors being worse off than others. The report also highlights the importance of strong password hygiene and the risks associated with weak and reused passwords. Overall, the report emphasizes the need for better security measures to protect sensitive corporate assets from malicious actors.