The UKs National Cyber Security Centre (NCSC) urges UK organizations to install the patches for the recently disclosed vulnerabilities in Microsoft Exchange. UK agency revealed to have helped UK organisations to secure their installs, around 2,100 vulnerable Microsoft Exchange servers. The agency added that it is not aware of successful. attacks against UK organizations that exploited Microsoft Exchange ProxyLogon flaws. The NCSC also recommends organizations to run Microsoft Safety Scanner to detect webshells employed in the attacks spotted by Microsoft.”]
Source: https://securityaffairs.co/wordpress/115605/hacking/ncsc-microsoft-exchange-assessment.html