Actively exploited in the wild
Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft - Exchange · Listed in the CISA KEV since 2021-11-17. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2021-42321
HighCVSS 8.8KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
Microsoft Exchange Server Remote Code Execution Vulnerability. Details are not provided in the description, but it is a serious flaw allowing remote code execution.
Risk Assessment
An attacker could remotely execute arbitrary code on the Exchange server, potentially leading to full system and data compromise.
Recommendation
It is recommended to immediately apply patches released by Microsoft for Exchange Server.
Original NVD description (English source)
Microsoft Exchange Server Remote Code Execution Vulnerability