Microsoft Exchangeの脆弱性をつく攻撃は現時点でも緊急の課題？

下記の記事が出ている。

　Cybercriminals scanned for vulnerable Microsoft Exchange servers within five minutes of news going public
　ZDNet: May 19, 2021
　https://www.zdnet.com/article/cybercriminals-scanned-for-vulnerable-microsoft-exchange-servers-within-five-minutes-of-news-going-public/