{
  "cveId": "CVE-2021-1723",
  "url": "https://patchblox.com/security/cve/CVE-2021-1723",
  "summary": "CVE-2021-1723 is fixed in 19 products on 1 platform, first by RHSA-2021:0095, released January 13, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ASP.NET Core and Visual Studio Denial of Service Vulnerability",
  "description": ".NET Core is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.\n\nNew versions of .NET Core that address a security vulnerability are now available. The updated versions are .NET Core SDK 3.1.111 and .NET Core Runtime 3.1.11.\n\nSecurity Fix(es):\n\n* dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock when using HTTP2 (CVE-2021-1723)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "published": "2021-01-12T14:00:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "epss": 0.05298,
  "epssPercentile": 0.92634,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1723",
  "fixes": [
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      "platform": "linux",
      "product": "aspnetcore-runtime-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.11-1.el8_3",
      "fix": "RHSA-2021:0095",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-0095",
      "released": "2021-01-13T00:00:00Z"
    },
    {
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      "product": "aspnetcore-runtime-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.11-1.0.1.el8_3",
      "fix": "ELSA-2021-0095",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-0095",
      "released": "2021-01-15T00:00:00Z"
    },
    {
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      "fix": "RHSA-2021:0094",
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    },
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      "fix": "ELSA-2021-0094",
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      "released": "2021-01-15T00:00:00Z"
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}