CVE-2021-26701 — .NET Core Remote Code Execution Vulnerability

Executive Summary

None

Overview

8.1

CVSS HIGH

Critical

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Feb 9 2021

Last Updated Feb 9 2021

Publicly Disclosed Yes

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.30315 — 0.98032 percentile

NVD CVSS 8.1 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

High

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.1

EPSS Score

0.30315

probability of exploitation in the next 30 days

0.98032 percentile - updated 2026-07-25

View on FIRST.org

Affected Products

11 affected products

Product	KB Article	Severity	Impact	Restart Required
.NET 5.0	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
.NET Core 2.1	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
.NET Core 3.1	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
Microsoft Visual Studio 2019 version 16.8 (includes 16.0 - 16.7)	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
PowerShell Core 7.0	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
PowerShell Core 7.1	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe
Visual Studio 2019 for Mac	`Release Notes (Security Update)`	Critical	Remote Code Execution	Maybe

Patches

1 patch

Article	Type	Restart
`Release Notes`	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

None

References

MSRC Advisory MITRE NVD