{"schemaVersion":3,"id":"CVE-2020-1161","aliases":["GHSA-3cf7-7wq6-8842","BIT-aspnet-core-2020-1161"],"status":"published","duplicateOf":null,"title":null,"description":"A denial of service vulnerability exists when ASP.NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against an ASP.NET Core web application. The vulnerability can be exploited remotely, without authentication.\nA remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the ASP.NET Core application.\nThe update addresses the vulnerability by correcting how the ASP.NET Core web application handles web requests.","dates":{"published":"2020-05-21T22:53:28.000Z","modified":"2026-08-19T16:34:12.596Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Nuget","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.05313,"percentile":0.92516,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.17099999999999962,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.05142},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.05313,"percentile":0.92516}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.05142,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.0527,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.05313,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.05313,"percentile":0.92516}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"microsoft","product":"asp.net_core","name":"asp.net core","label":"asp.net_core","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"3.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"3.1","eol":null,"hubHref":"/vendor/microsoft/aspnet_core"},{"vendor":"microsoft","product":"asp.net core 3.1","name":"ASP.NET Core 3.1","label":"asp.net core 3.1","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0, < publication","eol":null,"hubHref":"/vendor/microsoft/aspnet_core_31"},{"vendor":"microsoft","product":"microsoft visual studio 2017 version 15.9 (includes 15.0 - 15.8)","name":"Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)","label":"microsoft visual studio 2017 version 15.9 (includes 15.0 - 15.8)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 15.9.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 15.9.0, < publication","eol":null,"hubHref":"/vendor/microsoft/microsoft_visual_studio_2017_version_159_includes_150_-_158"},{"vendor":"microsoft","product":"microsoft visual studio 2019 version 16.0","name":"Microsoft Visual Studio 2019 version 16.0","label":"microsoft visual studio 2019 version 16.0","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 16.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 16.0, < publication","eol":null,"hubHref":"/vendor/microsoft/microsoft_visual_studio_2019_version_160"},{"vendor":"microsoft","product":"microsoft visual studio 2019 version 16.4 (includes 16.0 - 16.3)","name":"Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)","label":"microsoft visual studio 2019 version 16.4 (includes 16.0 - 16.3)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 16.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 16.0, < publication","eol":null,"hubHref":"/vendor/microsoft/microsoft_visual_studio_2019_version_164_includes_160_-_163"},{"vendor":"microsoft","product":"microsoft visual studio 2019 version 16.5","name":"Microsoft Visual Studio 2019 version 16.5","label":"microsoft visual studio 2019 version 16.5","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 16.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 16.0, < publication","eol":null,"hubHref":"/vendor/microsoft/microsoft_visual_studio_2019_version_165"},{"vendor":"microsoft","product":"visual_studio_2017","name":"visual studio 2017","label":"visual_studio_2017","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 15.1, ≤ 15.9","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 15.1, ≤ 15.9","eol":null,"hubHref":"/vendor/microsoft/visual_studio_2017"},{"vendor":"microsoft","product":"visual_studio_2019","name":"visual studio 2019","label":"visual_studio_2019","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 16.0, ≤ 16.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 16.0, ≤ 16.5","eol":null,"hubHref":"/vendor/microsoft/visual_studio_2019"},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.linux-arm","name":"Microsoft.AspNetCore.App.Runtime.linux-arm","label":"Microsoft.AspNetCore.App.Runtime.linux-arm","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-arm","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.linux-arm64","name":"Microsoft.AspNetCore.App.Runtime.linux-arm64","label":"Microsoft.AspNetCore.App.Runtime.linux-arm64","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-arm64","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.linux-musl-arm64","name":"Microsoft.AspNetCore.App.Runtime.linux-musl-arm64","label":"Microsoft.AspNetCore.App.Runtime.linux-musl-arm64","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.linux-musl-x64","name":"Microsoft.AspNetCore.App.Runtime.linux-musl-x64","label":"Microsoft.AspNetCore.App.Runtime.linux-musl-x64","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-musl-x64","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.linux-x64","name":"Microsoft.AspNetCore.App.Runtime.linux-x64","label":"Microsoft.AspNetCore.App.Runtime.linux-x64","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.linux-x64","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.osx-x64","name":"Microsoft.AspNetCore.App.Runtime.osx-x64","label":"Microsoft.AspNetCore.App.Runtime.osx-x64","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.osx-x64","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.win-arm","name":"Microsoft.AspNetCore.App.Runtime.win-arm","label":"Microsoft.AspNetCore.App.Runtime.win-arm","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-arm","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.win-x64","name":"Microsoft.AspNetCore.App.Runtime.win-x64","label":"Microsoft.AspNetCore.App.Runtime.win-x64","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-x64","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null},{"vendor":"NuGet","product":"Microsoft.AspNetCore.App.Runtime.win-x86","name":"Microsoft.AspNetCore.App.Runtime.win-x86","label":"Microsoft.AspNetCore.App.Runtime.win-x86","ecosystem":"NuGet","cpePart":null,"purl":"pkg:nuget/Microsoft.AspNetCore.App.Runtime.win-x86","purlType":"nuget","versions":[{"text":"≥ 3.1.0, < 3.1.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.1.0, < 3.1.4","eol":null,"hubHref":null}],"affectedCount":17,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1161","label":"msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1161","hostname":"msrc.microsoft.com","tags":["Vendor Advisory","Patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1161","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1161","hostname":"portal.msrc.microsoft.com","tags":["X Refsource MISC","X Transferred","WEB","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-1161","label":"nvd.nist.gov/vuln/detail/CVE-2020-1161","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/aspnet/Announcements/issues/416","label":"github.com/aspnet/Announcements/issues/416","hostname":"github.com","tags":["WEB"]}],"lineage":{"upstream":[],"downstream":["RHSA-2020:2249","RHSA-2020:2250"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-05-21T22:53:28.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-19T16:34:12.596Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":31,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T16:03:47.076Z","stale":false,"partial":false}}