CVE-2021-34520 — Microsoft SharePoint Server Remote Code Execution Vulnerability

Executive Summary

None

Overview

8.1

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

More Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Jul 13 2021

Last Updated Jul 13 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

NVD CVSS 8.1 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.1

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

3 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft SharePoint Enterprise Server 2016	`5001976 (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft SharePoint Server 2019	`5001975 (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft SharePoint Foundation 2013 Service Pack 1	`5001992 (Security Update)`	Important	Remote Code Execution	Maybe

Patches

3 patches

Article	Type	Restart
`5001976`	Security Update	Maybe
`5001975`	Security Update	Maybe
`5001992`	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

Anonymous working with Trend Micro Zero Day Initiative

References

MSRC Advisory MITRE NVD