CVE-2021-26855: Microsoft Exchange Server Remote Code Execution Vulnerability
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:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Microsoft: Microsoft Exchange Server 2013 Cumulative Update 21Microsoft: Microsoft Exchange Server 2013 Cumulative Update 22Microsoft: Microsoft Exchange Server 2013 Cumulative Update 23Microsoft: Microsoft Exchange Server 2016 Cumulative Update 10Microsoft: Microsoft Exchange Server 2016 Cumulative Update 11Microsoft: Microsoft Exchange Server 2016 Cumulative Update 12Microsoft: Microsoft Exchange Server 2016 Cumulative Update 13Microsoft: Microsoft Exchange Server 2016 Cumulative Update 14Microsoft: Microsoft Exchange Server 2016 Cumulative Update 15Microsoft: Microsoft Exchange Server 2016 Cumulative Update 16Microsoft: Microsoft Exchange Server 2016 Cumulative Update 17Microsoft: Microsoft Exchange Server 2016 Cumulative Update 18Microsoft: Microsoft Exchange Server 2016 Cumulative Update 19Microsoft: Microsoft Exchange Server 2016 Cumulative Update 8Microsoft: Microsoft Exchange Server 2016 Cumulative Update 9Microsoft: Microsoft Exchange Server 2019Microsoft: Microsoft Exchange Server 2019 Cumulative Update 1Microsoft: Microsoft Exchange Server 2019 Cumulative Update 2Microsoft: Microsoft Exchange Server 2019 Cumulative Update 3Microsoft: Microsoft Exchange Server 2019 Cumulative Update 4Microsoft: Microsoft Exchange Server 2019 Cumulative Update 5Microsoft: Microsoft Exchange Server 2019 Cumulative Update 6Microsoft: Microsoft Exchange Server 2019 Cumulative Update 7Microsoft: Microsoft Exchange Server 2019 Cumulative Update 8
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26855 (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)