In July, REvil, a Russian cybercriminal gang, was able to shut down the IT systems of 800 Swedish grocery stores, a couple of New Zealand schools, two Maryland town governments, and around a thousand other enterprises around the world. The attackers discovered that Kaseya, a software used by IT service contractors to remotely manage corporate networks, had numerous cybersecurity vulnerabilities. By attacking Kaseya, REvil gained a backdoor into the IT systems of the many organizations the software supported. Kaseya was thus a potent attack vector.