Developer Tools
CVE-2021-1721 — .NET Core and Visual Studio Denial of Service Vulnerability
Executive Summary
None
Overview
6.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.9
EPSS Score
0.0334
probability of exploitation in the next 30 days
0.87385 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
9 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| .NET 5.0 | Release Notes (Security Update) |
Important | Denial of Service | Maybe |
| .NET Core 2.1 | 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 2017 version 15.9 (includes 15.0 - 15.8) | 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 16.8 | Release Notes (Security Update) |
Important | Denial of Service | Maybe |
| PowerShell Core 7.0 | Release Notes (Security Update) |
Important | Denial of Service | Maybe |
| PowerShell Core 7.1 | Release Notes (Security Update) |
Important | Denial of Service | 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
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