40.8% of smart homes have at least one device vulnerable to remote attacks. 40.3% of all smart households come with at least five devices connected to the Internet. A third of those devices are vulnerable because of outdated software with unpatched security issues, while more than two-thirds are exposed by weak credentials. Printer is the most vulnerable to attacks, followed by NAS devices and security cameras. DDoS attacks are seen as the highest threat to companies, with half of their companies having been attacked in 2018.
Source: https://www.bleepingcomputer.com/news/security/smart-homes-at-risk-due-to-unpatched-vulnerabilities-weak-credentials/