A security researcher has released a new proof-of-concept exploit for ProxyLogon issues that could be adapted to install web shells on vulnerable Microsoft Exchange servers. Security experts observed a surge in the attacks against Microsoft Exchange mailservers worldwide. Most of exploit attempts targeted organizations in Turkey (19%), followed by United States (18%) and Italy (10%) Government/Military (17% of all exploit attempts), followed by Manufacturing (14%) and then Banking (11%) Security experts pointed out that the flaws are actively exploited to deliver web shells.”]
Source: https://securityaffairs.co/wordpress/115616/hacking/microsoft-exchange-exploit-is-out.html