Actively exploited in the wild
Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft - Exchange Server · Listed in the CISA KEV since 2021-11-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2021-27065
HighCVSS 7.8KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
A remote code execution vulnerability in Microsoft Exchange Server allows an attacker to execute arbitrary code in the context of the system on the Exchange server.
Risk Assessment
An attacker could take control of the Exchange server, leading to data theft, malware propagation, and disruption of email services.
Recommendation
Apply Microsoft's security updates for Exchange Server immediately and check systems for signs of compromise.
Original NVD description (English source)
Microsoft Exchange Server Remote Code Execution Vulnerability