4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
0.001 Low
EPSS
Percentile
47.2%
Vulnerability Details:
This vulnerability allows remote attackers to cause a denial of service on affected installations of SharePoint Server. Authentication is required to exploit this vulnerability.
The specific flaw exists within the InputFormRegularExpressionValidator class. The issue results from the lack of proper validation of the user-supplied ValidationExpression property. An attacker can leverage this vulnerability to cause a regular expression denial of service.
Affected Vendors:
Microsoft
Affected Products:
SharePoint Server
Vendor Response:
Microsoft has issued an update to correct this vulnerability. More details can be found at: <https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-28450>
4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:N/I:N/A:P
5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
0.001 Low
EPSS
Percentile
47.2%