CVE-2021-31171
Microsoft SharePoint Information Disclosure Vulnerability
Microsoft SharePoint Information Disclosure Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Microsoft SharePoint Information Disclosure Vulnerability
Microsoft SharePoint Information Disclosure Vulnerability
- Record
CVE-2021-31171- CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-18084
Microsoft SharePoint Information Disclosure Vulnerability
- Record
EUVD-2021-18084- CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-r5w2-v2mp-q9qv
Microsoft SharePoint Information Disclosure Vulnerability
Microsoft SharePoint Information Disclosure Vulnerability
- Record
GHSA-r5w2-v2mp-q9qv- CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
NVD
Microsoft SharePoint Information Disclosure Vulnerability
- Record
CVE-2021-31171- CVSS 3.1
- 4.1 Medium
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N - CVSS 3.1
- 4.4 Medium
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:P/I:N/A:N - 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-2021-31171 is a medium vulnerability (CVSS 4.1) in Microsoft Sharepoint Enterprise Server 2016, published May 11, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.65%, the 51st percentile. No source names a fixed version.