CVE-2021-28450
Microsoft SharePoint Denial of Service Vulnerability
Microsoft SharePoint Denial of Service Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Microsoft SharePoint Denial of Service Vulnerability
Microsoft SharePoint Denial of Service Vulnerability
- Record
CVE-2021-28450- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-15129
Microsoft SharePoint Denial of Service Vulnerability
- Record
EUVD-2021-15129- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xw5f-m9q2-678f
Microsoft SharePoint Denial of Service Update
Microsoft SharePoint Denial of Service Update
- Record
GHSA-xw5f-m9q2-678f- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L - Updated
- 2026-11-02
NVD
Microsoft SharePoint Denial of Service Vulnerability
- Record
CVE-2021-28450- CVSS 3.1
- 5.0 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:N/I:N/A:P - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-28450 is a medium vulnerability (CVSS 5.0) in Microsoft Sharepoint Enterprise Server 2013 Service Pack 1, published April 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.56%, the 85th percentile. No source names a fixed version.