Exploited vulnerability
CVE-2021-42321
TLP:CLEAR
Microsoft Exchange Server Remote Code Execution Vulnerability
An authenticated attacker could leverage improper validation in cmdlet arguments within Microsoft Exchange and perform remote code execution.
Facts
- Vendor: Microsoft
- Product: Exchange
- CVSS: 8.8
- EPSS (probability of exploitation within 30 days): 91.7 %
- On CISA's Known Exploited Vulnerabilities list since: 17 November 2021
- First known exploitation: 17 November 2021
- Used in ransomware campaigns (per CISA): Yes
- CISA's deadline for US federal agencies: 1 December 2021
- Weakness: CWE-184
- First seen by Risk Letters: 17 November 2021
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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD