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.NET Core & Visual Studio

CVE-2021-31957 — ASP.NET Core Denial of Service Vulnerability

Important CVSS 5.9 EPSS 0.05119 2021-06 archive

Executive Summary

None

Overview

5.9
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Denial of Service
Released Jun 8 2021
Last Updated Jun 8 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.05119 — 0.91292 percentile
NVD CVSS 5.9 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.2

EPSS Score

0.05119
probability of exploitation in the next 30 days
0.91292 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

7 affected products
Product KB Article Severity Impact Restart Required
.NET 5.0 Release Notes (Security Update) Important Denial of Service Maybe
.NET Core 3.1 Release Notes (Security Update) Important Denial of Service Maybe
Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9) Release Notes (Security Update) Important Denial of Service Maybe
Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) Release Notes (Security Update) Important Denial of Service Maybe
Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) Release Notes (Security Update) Important Denial of Service Maybe
Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) Release Notes (Security Update) Important Denial of Service Maybe
Visual Studio 2019 for Mac version 8.10 Release Notes (Security Update) Important Denial of Service Maybe

Patches

1 patch
Article Type Restart
Release Notes Security Update Maybe

Known Exploits

Acknowledgments

None

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