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Net Core CVE-2021-1721

MEDIUM
2021-02-25 secure@microsoft.com
Denial Of Service Microsoft Visual Studio 2017 Visual Studio 2019 Net Net Core Powershell Core
6.5
CVSS 3.1 · Vendor: microsoft
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Vulnerability Assessment

Impact

CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 3.3% exploitation probability (EPSS)

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AnalysisAI

.NET Core and Visual Studio Denial of Service Vulnerability. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected Packages

nuget microsoft.netcore.app fix: 2.1.25
nuget microsoft.netcore.app.host.linux-arm fix: 3.1.12
nuget microsoft.netcore.app.host.linux-arm64 fix: 3.1.12
nuget microsoft.netcore.app.host.linux-musl-arm64 fix: 3.1.12
nuget microsoft.netcore.app.host.linux-musl-x64 fix: 3.1.12
nuget microsoft.netcore.app.host.linux-x64 fix: 3.1.12
nuget microsoft.netcore.app.host.osx-x64 fix: 3.1.12
nuget microsoft.netcore.app.host.rhel.6-x64 fix: 3.1.12
nuget microsoft.netcore.app.host.win-arm fix: 3.1.12
nuget microsoft.netcore.app.host.win-arm64 fix: 3.1.12
nuget microsoft.netcore.app.host.win-x64 fix: 3.1.12
nuget microsoft.netcore.app.host.win-x86 fix: 3.1.12
nuget microsoft.netcore.app.runtime.android-arm fix: 5.0.3
nuget microsoft.netcore.app.runtime.android-arm64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.android-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.android-x86 fix: 5.0.3
nuget microsoft.netcore.app.runtime.browser-wasm fix: 5.0.3
nuget microsoft.netcore.app.runtime.ios-arm fix: 5.0.3
nuget microsoft.netcore.app.runtime.ios-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.ios-x86 fix: 5.0.3
nuget microsoft.netcore.app.runtime.linux-arm fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.linux-arm64 fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.linux-musl-arm fix: 5.0.3
nuget microsoft.netcore.app.runtime.linux-musl-arm64 fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.linux-musl-x64 fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.linux-x64 fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.mono.linux-arm fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.linux-arm64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.linux-musl-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.linux-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.llvm.aot.linux-arm64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.llvm.aot.linux-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.llvm.aot.osx-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.llvm.linux-arm64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.llvm.linux-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.llvm.osx-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.mono.osx-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.osx-x64 fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.rhel.6-x64 fix: 3.1.12
nuget microsoft.netcore.app.runtime.tvos-arm64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.tvos-x64 fix: 5.0.3
nuget microsoft.netcore.app.runtime.win-arm fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.win-arm64 fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.win-x64 fix: 3.1.12, 5.0.3
nuget microsoft.netcore.app.runtime.win-x86 fix: 3.1.12, 5.0.3

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 45 packages in nuget

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Technical ContextAI · show details

Affected products include: Microsoft .Net, Microsoft .Net Core, Microsoft Powershell Core, Microsoft Visual Studio 2017, Microsoft Visual Studio 2019.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (microsoft) PRIMARY 6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Primary rating from Vendor (microsoft) · only source for this CVE.

CVSS VectorVendor: microsoft

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionCVE.org

.NET Core and Visual Studio Denial of Service Vulnerability

Threat Intelligence Overview

EPSS Score
3.3%
Top 13% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 3.3%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

35
Low Medium High Critical
KEV: 0
EPSS: +3
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:powershell_core:7.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:powershell_core:7.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*

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References

Advisories & patches
PATCH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1721

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