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CVE-2021-31181

55
FAUCET Score

CVE-2021-31181 is a critical Remote Code Execution (RCE) vulnerability affecting Microsoft SharePoint Enterprise Server, Foundation, and Server products. With a CVSS score of 8.8 (HIGH), it allows an authenticated attacker to execute arbitrary code remotely with low attack complexity and no user interaction, leading to high impact on confidentiality, integrity, and availability. While not currently on CISA's KEV catalog, a Metasploit module exists, indicating public exploit code availability. The vulnerability has garnered significant community discussion and media coverage, suggesting awareness among security researchers and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
2016CPE matchmatch criteria
cpe:2.3:a:microsoft:sharepoint_enterprise_server:2016:*:*:*:*:*:*:*
2013CPE matchmatch criteria
cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:*
2019CPE matchmatch criteria
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
30.04%
Probability of exploitation in next 30 days
EPSS Percentile
98.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Metasploit: Microsoft SharePoint Unsafe Control and ViewState RCE · May 11, 2021
This CVE's current EPSS score of 0.3004 is in the 97th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Microsoft SharePoint Enterprise Server 2016Fixed in: 16.0.5161.1000
View patch
microsoftpatch availablevia msrc
Product: Microsoft SharePoint Server 2019Fixed in: 16.0.10374.20000
View patch
microsoftpatch availablevia msrc
Product: Microsoft SharePoint Foundation 2013 Service Pack 1Fixed in: 15.0.5345.1000
View patch

Vendor Advisories (1)

microsoft2021-May/CVE-2021-31181Important

Microsoft SharePoint Remote Code Execution Vulnerability

May 11, 2021

References

packetstorm.news / files/id/163208
packetstormsecurity.com / files/163208/Microsoft-SharePoint-Unsafe-Control-And-ViewState-Remote-Code-Execution.html
ExploitThird Party AdvisoryVDB Entry
portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-31181
PatchVendor Advisory
zerodayinitiative.com / advisories/ZDI-21-573
Third Party AdvisoryVDB Entry