CVE-2021-42321
high
Microsoft
⚠️ CISA KEV — Exploited in the Wild
CVSS v3 Base Score
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score
90.4%
Exploitation probability in 30 days
Top 0% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: November 10, 2021 (1763 days ago)
Last Modified: August 19, 2026
Vendor: Microsoft
Source: NVD
⚠️ CISA Known Exploited Vulnerability
Added to KEV: 2021-11-17
Remediation Due: 2021-12-01 (⚠ 1742d overdue)
Ransomware Campaign: Known
Vulnerability Report
Generated by CyberWatcher
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
CWE
NVD-CWE-OtherAffected Products
microsoft exchange server