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-2021-34473
CriticalCVSS 9.1KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
Remote code execution vulnerability in Microsoft Exchange Server. Allows an attacker to execute arbitrary code remotely on the server.
Risk Assessment
An attacker can take control of the Exchange server, potentially leading to data confidentiality and integrity breaches and further spread of the attack within the network.
Recommendation
Install the latest security updates provided by Microsoft for Exchange Server.
Original NVD description (English source)
Microsoft Exchange Server Remote Code Execution Vulnerability