CVE-2021-42294 — Microsoft SharePoint Server Remote Code Execution Vulnerability

Executive Summary

None

Overview

7.2

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Dec 14 2021

Last Updated Dec 14 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.02182 — 0.80023 percentile

NVD CVSS 7.2 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

High

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.3

EPSS Score

0.02182

probability of exploitation in the next 30 days

0.80023 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

3 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft SharePoint Enterprise Server 2013 Service Pack 1	`5002008 (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft SharePoint Enterprise Server 2016 5002055 (Security Update) 5002059 (Security Update) Important Remote Code Execution 5002029 5002006 Base: 7.2 Temporal: 6.3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 16.0.5254.1000 Maybe None Microsoft SharePoint Foundation 2013 Service Pack 1 5002071 (Security Update) 5002015 (Security Update) Important Remote Code Execution 5002042 5001996 Base: 7.2 Temporal: 6.3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 15.0.5407.1000 Maybe None Microsoft SharePoint Server 2019 5002054 (Security Update) 5002061 (Security Update) Important Remote Code Execution 5002028 5001945 Base: 7.2 Temporal: 6.3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 16.0.10381.20001 Maybe None Microsoft SharePoint Server Subscription Edition	`5002045 (Security Update)`	Important	Remote Code Execution	Maybe
SharePoint Server Subscription Edition Language Pack	`5002047 (Security Update)`	Important	Remote Code Execution	Maybe

Patches

3 patches

Article	Type	Restart
`5002008`	Security Update	Maybe
`5002045`	Security Update	Maybe
`5002047`	Security Update	Maybe

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Yuhao Weng

References

MSRC Advisory MITRE NVD