{
  "cveId": "CVE-2020-1045",
  "url": "https://patchblox.com/security/cve/CVE-2020-1045",
  "summary": "CVE-2020-1045 is fixed in 11 products on 1 platform, first by RHSA-2020:3699, released September 8, 2020. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Microsoft ASP.NET Core Security Feature Bypass Vulnerability",
  "description": "\u003Cp\u003EA security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.\u003C/p\u003E\n\u003Cp\u003EThe ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded.\u003C/p\u003E\n\u003Cp\u003EThe security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.\u003C/p\u003E",
  "published": "2020-09-08T00:00:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "epss": 0.05926,
  "epssPercentile": 0.93296,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1045",
  "fixes": [
    {
      "platform": "linux",
      "product": "aspnetcore-runtime-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-runtime-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-targeting-pack-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "aspnetcore-targeting-pack-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.108-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet",
      "release": "ol 8",
      "fixedVersion": "0:3.1.108-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-apphost-pack-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-apphost-pack-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-host",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-host",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-hostfxr-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-hostfxr-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-runtime-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dotnet-runtime-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
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      "fixedVersion": "0:3.1.108-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
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      "release": "ol 8",
      "fixedVersion": "0:3.1.108-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
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      "product": "dotnet-targeting-pack-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.8-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
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      "product": "dotnet-targeting-pack-3.1",
      "release": "ol 8",
      "fixedVersion": "0:3.1.8-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
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      "product": "dotnet-templates-3.1",
      "release": "RHEL 8",
      "fixedVersion": "0:3.1.108-2.el8_2",
      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
      "released": "2020-09-08T00:00:00Z"
    },
    {
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      "release": "ol 8",
      "fixedVersion": "0:3.1.108-2.0.1.el8_2",
      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    },
    {
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      "fix": "RHSA-2020:3699",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2020-3699",
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      "fix": "ELSA-2020-3699",
      "url": "https://patchblox.com/security/fix/linux/elsa-2020-3699",
      "released": "2020-09-11T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}