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CVE-2021-1721 (GCVE-0-2021-1721)

Vulnerability from cvelistv5 – Published: 2021-02-25 23:01 – Updated: 2026-05-28 19:30
VLAI
Title
.NET Core and Visual Studio Denial of Service Vulnerability
Summary
.NET Core and Visual Studio Denial of Service Vulnerability
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-01-03 18:38 UTC
CWE
References
Impacted 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:*:*:*:*:*:*:*:*
Create a notification for this product.
Microsoft PowerShell Core 7.1 Affected: 7.1.0 , < publication (custom)
    cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*
Create a notification for this product.
Microsoft PowerShell Core 7.0 Affected: 7.0.0 , < publication (custom)
    cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*
Create a notification for this product.
Microsoft .NET Core 2.1 Affected: 2.1 , < publication (custom)
    cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*
Create a notification for this product.
Microsoft .NET Core 3.1 Affected: 3.1 , < publication (custom)
    cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*
Create a notification for this product.
Microsoft .NET 5.0 Affected: 5.0.0 , < publication (custom)
    cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
Create a notification for this product.
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:*:*:*:*:*:*:*:*
Create a notification for this product.
Microsoft Microsoft Visual Studio 2019 version 16.8 Affected: 16.0 , < publication (custom)
    cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*
Create a notification for this product.
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:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2021-02-09 08:00
Show details on NVD website

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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1721\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T16:18:11.551Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-1721\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-01-03T18:38:54.615731Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-28T19:27:15.823Z\"}}], \"cna\": {\"title\": \".NET Core and Visual Studio Denial of Service Vulnerability\", \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en-US\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Visual Studio 2019 version 16.7 (includes 16.0 \\u2013 16.6)\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"PowerShell Core 7.1\", \"versions\": [{\"status\": \"affected\", \"version\": \"7.1.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"PowerShell Core 7.0\", \"versions\": [{\"status\": \"affected\", \"version\": \"7.0.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \".NET Core 2.1\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.1\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \".NET Core 3.1\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.1\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \".NET 5.0\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.0.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Visual Studio 2019 version 16.8\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}, {\"cpes\": [\"cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*\"], \"vendor\": \"Microsoft\", \"product\": \"Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.9.0\", \"lessThan\": \"publication\", \"versionType\": \"custom\"}], \"platforms\": [\"Unknown\"]}], \"datePublic\": \"2021-02-09T08:00:00.000Z\", \"references\": [{\"url\": \"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1721\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \".NET Core and Visual Studio Denial of Service Vulnerability\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"Impact\", \"description\": \"Denial of Service\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2023-12-29T22:33:17.653Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-1721\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-28T19:30:20.892Z\", \"dateReserved\": \"2020-12-02T00:00:00.000Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2021-02-25T23:01:26.000Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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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Detection rules are retrieved from Rulezet.

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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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