CVE-2021-42321: Microsoft Exchange Server Remote Code Execution Vulnerability
High · CVSS 8.8 (CVSS 3.1)KEV known exploitedEPSS 91.7%, 100th percentilePublished Updated Assigner: microsoft
In CISA’s Known Exploited Vulnerabilities catalog: Microsoft Exchange Server Remote Code Execution Vulnerability.
Added , federal remediation due . Known ransomware use: Known.
Required action: Apply updates per vendor instructions.
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Microsoft: Microsoft Exchange Server 2016 Cumulative Update 21Microsoft: Microsoft Exchange Server 2016 Cumulative Update 22Microsoft: Microsoft Exchange Server 2019 Cumulative Update 10Microsoft: Microsoft Exchange Server 2019 Cumulative Update 11
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42321 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)