CVE-2021-31181 in the critical feed json
Microsoft SharePoint Remote Code Execution Vulnerability
published 5y ago modified 4mo ago also EUVD-2021-18094
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 29.0%
- EPSS 29.0% chance of exploitation in 30 days, percentile 98%
- public exploits
- 1
- Metasploit
Summary
Microsoft SharePoint Remote Code Execution Vulnerability
Patch / fix
- Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.5161.1000
- Microsoft Microsoft SharePoint Server 2019 16.0.10374.20000
- Microsoft Microsoft SharePoint Foundation 2013 Service Pack 1 15.0.5345.1000
Is CVE-2021-31181 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerTimeline
- First public exploit (Metasploit exploit/windows/http/sharepoint_unsafe_control)
- Published
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- last yr.
Exploit prediction
29.01% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- Metasploit exploit/windows/http/sharepoint_unsafe_control Microsoft SharePoint Unsafe Control and ViewState RCE metasploit exploit, excellent rank, 2021-05-11
- packetstorm.news https://packetstorm.news/files/id/163208 referenced PoC, tagged "exploit" by a source, unverified
- packetstormsecurity.com http://packetstormsecurity.com/files/163208/Microsoft-SharePoint-Unsafe-Control-And-ViewState-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Affected products
- Microsoft Microsoft SharePoint Enterprise Server 2016
- Microsoft Microsoft SharePoint Server 2019
- Microsoft Microsoft SharePoint Foundation 2013 Service Pack 1
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-31181
patch, vendor-advisory
-
packetstorm.news
/files/id/163208
exploit
-
packetstormsecurity.com
/files/163208/Microsoft-SharePoint-Unsafe-Control-And-ViewState-Remote-Code-Execution.html
exploit, third-party-advisory, vdb-entry
-
zerodayinitiative.com
/advisories/ZDI-21-573/
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-31181
- NVD CVE-2021-31181
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.