{
  "cveId": "CVE-2021-31957",
  "url": "https://patchblox.com/security/cve/CVE-2021-31957",
  "summary": "CVE-2021-31957 is fixed in 19 products on 1 platform, first by RHSA-2021:2352, released June 9, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ASP.NET Core Denial of Service Vulnerability",
  "description": "ELSA-2021-2352: .NET Core 3.1 security and bugfix update (IMPORTANT)",
  "published": "2021-06-08T12:00:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "epss": 0.05138,
  "epssPercentile": 0.92472,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31957",
  "fixes": [
    {
      "platform": "linux",
      "product": "aspnetcore-runtime-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.16-1.el8_4",
      "fix": "RHSA-2021:2352",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2352",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-runtime-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.16-1.0.1.el8_4",
      "fix": "ELSA-2021-2352",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2352",
      "released": "2021-06-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-runtime-5.0",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.7-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-runtime-5.0",
      "release": "ol 8",
      "fixedVersion": "0:5.0.7-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-targeting-pack-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.16-1.el8_4",
      "fix": "RHSA-2021:2352",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2352",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-targeting-pack-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.16-1.0.1.el8_4",
      "fix": "ELSA-2021-2352",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2352",
      "released": "2021-06-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-targeting-pack-5.0",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.7-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-targeting-pack-5.0",
      "release": "ol 8",
      "fixedVersion": "0:5.0.7-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.204-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet",
      "release": "ol 8",
      "fixedVersion": "0:5.0.204-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-apphost-pack-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.16-1.el8_4",
      "fix": "RHSA-2021:2352",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2352",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-apphost-pack-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.16-1.0.1.el8_4",
      "fix": "ELSA-2021-2352",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2352",
      "released": "2021-06-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-apphost-pack-5.0",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.7-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-apphost-pack-5.0",
      "release": "ol 8",
      "fixedVersion": "0:5.0.7-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-host",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.7-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-host",
      "release": "ol 8",
      "fixedVersion": "0:5.0.7-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-hostfxr-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.16-1.el8_4",
      "fix": "RHSA-2021:2352",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2352",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-hostfxr-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.16-1.0.1.el8_4",
      "fix": "ELSA-2021-2352",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2352",
      "released": "2021-06-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-hostfxr-5.0",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.7-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-hostfxr-5.0",
      "release": "ol 8",
      "fixedVersion": "0:5.0.7-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-runtime-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.16-1.el8_4",
      "fix": "RHSA-2021:2352",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2352",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-runtime-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.16-1.0.1.el8_4",
      "fix": "ELSA-2021-2352",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2352",
      "released": "2021-06-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-runtime-5.0",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.7-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-runtime-5.0",
      "release": "ol 8",
      "fixedVersion": "0:5.0.7-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-sdk-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.116-1.el8_4",
      "fix": "RHSA-2021:2352",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2352",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-sdk-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.116-1.0.1.el8_4",
      "fix": "ELSA-2021-2352",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2352",
      "released": "2021-06-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-sdk-5.0",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.204-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-sdk-5.0",
      "release": "ol 8",
      "fixedVersion": "0:5.0.204-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-targeting-pack-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.16-1.el8_4",
      "fix": "RHSA-2021:2352",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2352",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-targeting-pack-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.16-1.0.1.el8_4",
      "fix": "ELSA-2021-2352",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2352",
      "released": "2021-06-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-targeting-pack-5.0",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.7-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-targeting-pack-5.0",
      "release": "ol 8",
      "fixedVersion": "0:5.0.7-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-templates-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.116-1.el8_4",
      "fix": "RHSA-2021:2352",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2352",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-templates-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.116-1.0.1.el8_4",
      "fix": "ELSA-2021-2352",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2352",
      "released": "2021-06-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-templates-5.0",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.204-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-templates-5.0",
      "release": "ol 8",
      "fixedVersion": "0:5.0.204-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "netstandard-targeting-pack-2.1",
      "release": "RHEL 8",
      "fixedVersion": "0:5.0.204-1.el8_4",
      "fix": "RHSA-2021:2353",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2353",
      "released": "2021-06-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "netstandard-targeting-pack-2.1",
      "release": "ol 8",
      "fixedVersion": "0:5.0.204-1.0.1.el8_4",
      "fix": "ELSA-2021-2353",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2353",
      "released": "2021-06-10T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-11T01:43:54Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}