CVE-2021-1721 (GCVE-0-2021-1721)
Vulnerability from cvelistv5 – Published: 2021-02-25 23:01 – Updated: 2026-05-28 19:30
VLAI
EPSS
VEX
Title
.NET Core and Visual Studio Denial of Service Vulnerability
Summary
.NET Core and Visual Studio Denial of Service Vulnerability
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-01-03 18:38 UTC
CWE
- Denial of Service
- CWE-noinfo Not enough information
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://portal.msrc.microsoft.com/en-US/security-… | x_refsource_MISC |
Impacted products
9 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) |
Affected:
16.0.0 , < publication
(custom)
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:* |
||
| Microsoft | PowerShell Core 7.1 |
Affected:
7.1.0 , < publication
(custom)
cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:* |
||
| Microsoft | PowerShell Core 7.0 |
Affected:
7.0.0 , < publication
(custom)
cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:* |
||
| Microsoft | .NET Core 2.1 |
Affected:
2.1 , < publication
(custom)
cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:* |
||
| Microsoft | .NET Core 3.1 |
Affected:
3.1 , < publication
(custom)
cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:* |
||
| Microsoft | .NET 5.0 |
Affected:
5.0.0 , < publication
(custom)
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:* |
||
| Microsoft | Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) |
Affected:
16.0 , < publication
(custom)
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:* |
||
| Microsoft | Microsoft Visual Studio 2019 version 16.8 |
Affected:
16.0 , < publication
(custom)
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:* |
||
| Microsoft | Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) |
Affected:
15.9.0 , < publication
(custom)
cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:* |
Date Public
2021-02-09 08:00
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"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "Microsoft Visual Studio 2019 version 16.7 (includes 16.0 \u2013 16.6)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "16.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "PowerShell Core 7.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "7.1.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "PowerShell Core 7.0",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "7.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": ".NET Core 2.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "2.1",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": ".NET Core 3.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "3.1",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": ".NET 5.0",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "5.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "16.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "Microsoft Visual Studio 2019 version 16.8",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "16.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*"
],
"platforms": [
"Unknown"
],
"product": "Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "publication",
"status": "affected",
"version": "15.9.0",
"versionType": "custom"
}
]
}
],
"datePublic": "2021-02-09T08:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": ".NET Core and Visual Studio Denial of Service Vulnerability"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "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",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Denial of Service",
"lang": "en-US",
"type": "Impact"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-12-29T22:33:17.653Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1721"
}
],
"title": ".NET Core and Visual Studio Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2021-1721",
"datePublished": "2021-02-25T23:01:26.000Z",
"dateReserved": "2020-12-02T00:00:00.000Z",
"dateUpdated": "2026-05-28T19:30:20.892Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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