6.6 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5 Medium
CVSS2
Access Vector
Access Complexity
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
0.01 Low
EPSS
Percentile
83.8%
Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exchange Server. Authentication with the “Records Management” role is required to exploit this vulnerability.
The specific flaw exists within the processing of the Import-TransportRuleCollection cmdlet. The issue results from the lack of proper validation of a user-supplied rule collection. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.
Affected Vendors:
Microsoft
Affected Products:
Exchange Server
Vendor Response:
Microsoft has issued an update to correct this vulnerability. More details can be found at: <https://portal.msrc.microsoft.com/security-guidance/advisory/CVE-2021-26854>
6.6 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5 Medium
CVSS2
Access Vector
Access Complexity
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
0.01 Low
EPSS
Percentile
83.8%