TLP Rating: White
On-Premises Exchange Server Vulnerabilities - CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065.
CERT Vanuatu (CERTVU) and the Office of the Government Information Officer was alerted of these vulnerabilities by its international partners.
The CERTVU office would like to advise institutions and corporate companies with on-premises Exchange Servers. Microsoft has detected multiple 0-day exploits being used to attack on-premises versions of MS Exchange servers in limited and targeted attacks.