Medium severity · published Nov 10, 2021
CVE-2021-42305
Microsoft Exchange Server Spoofing Vulnerability
6.5
CVSS
7.9%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)7.9% · higher than 95% 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-2021-42305
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-42305
msrc.microsoft.com
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42305
Patch
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42305
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