Critical severity · published Mar 3, 2021
CVE-2021-27078
Microsoft Exchange Server Remote Code Execution Vulnerability
9.1
CVSS
21.6%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)21.6% · higher than 98% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ES
Exchange Server · Microsoft
2013; 2016; 2016; 2019; 2019 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27078
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27078
msrc.microsoft.com
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27078
Patch
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27078
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