{"id":"CVE-2023-38171","aliases":["ALPINE-CVE-2023-38171","BIT-dotnet-2023-38171","BIT-dotnet-sdk-2023-38171","EUVD-2023-2837","GHSA-xh5m-8qqp-c5x7"],"status":"published","title":"Microsoft QUIC Denial of Service Vulnerability","description":"Microsoft QUIC Denial of Service Vulnerability","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.71046,"percentile":0.99413,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-476"],"published":"2023-10-10T17:07:23Z","modified":"2026-11-03T06:32:43Z","fixes":[{"ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.Schannel","fixed_in":["2.2.3"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.OpenSSL","fixed_in":["2.2.3"],"sources":["ghsa","osv"]},{"ecosystem":"Alpine:v3.18","package":"dotnet7-build","fixed_in":["7.0.112-r0","7.0.113-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"dotnet7-build","fixed_in":["7.0.112-r0","7.0.113-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"dotnet7-runtime","fixed_in":["7.0.12-r0","7.0.13-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"dotnet7-runtime","fixed_in":["7.0.12-r0","7.0.13-r0"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"dotnet","fixed_in":["7.0.12"],"sources":["osv"]},{"ecosystem":"Bitnami","package":"dotnet-sdk","fixed_in":["7.0.12"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.Schannel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.3"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"dotnet7-build","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.112-r0"},{"fixed":"7.0.113-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"dotnet7-build","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.112-r0"},{"fixed":"7.0.113-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"dotnet7-runtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.12-r0"},{"fixed":"7.0.13-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"dotnet7-runtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.12-r0"},{"fixed":"7.0.13-r0"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"dotnet","ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"7.0.12"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"dotnet-sdk","ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"7.0.12"}]}]},{"source":"osv","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.Schannel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.3"}]}],"versions":["1.8.0"]},{"source":"osv","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.3"}]}],"versions":["1.8.0"]}],"products":[{"vendor":"microsoft","product":".net"},{"vendor":"microsoft","product":".net 7.0"},{"vendor":"microsoft","product":"microsoft visual studio 2022 version 17.2"},{"vendor":"microsoft","product":"microsoft visual studio 2022 version 17.4"},{"vendor":"microsoft","product":"microsoft visual studio 2022 version 17.6"},{"vendor":"microsoft","product":"microsoft visual studio 2022 version 17.7"},{"vendor":"microsoft","product":"powershell 7.3"},{"vendor":"microsoft","product":"visual_studio_2022"},{"vendor":"microsoft","product":"windows 11 version 21h2"},{"vendor":"microsoft","product":"windows 11 version 22h2"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows_11_22h2"},{"vendor":"microsoft","product":"windows_server_2022"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38171","tags":["vendor-advisory","x_transferred","Patch","Vendor Advisory","advisory","fix","web"]},{"url":"https://github.com/microsoft/msquic/security/advisories/GHSA-xh5m-8qqp-c5x7","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-38171","tags":["web","advisory"]},{"url":"https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343","tags":["web"]},{"url":"https://github.com/advisories/GHSA-xh5m-8qqp-c5x7"},{"url":"https://security.alpinelinux.org/vuln/CVE-2023-38171","tags":["advisory"]},{"url":"https://github.com/microsoft/msquic","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-38171","title":"Microsoft QUIC Denial of Service Vulnerability","description":"Microsoft QUIC Denial of Service Vulnerability","status":"published","published":"2023-10-10T17:07:23.843Z","modified":"2025-04-14T22:45:47.105Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:35:30.116696Z"}],"euvd":[{"id":"EUVD-2023-2837","description":"Microsoft QUIC Denial of Service Vulnerability","status":"published","published":"2023-10-10T17:07:23Z","modified":"2025-04-14T22:45:47Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T20:52:32.642133Z"}],"ghsa":[{"id":"GHSA-xh5m-8qqp-c5x7","title":"Remote Denial of Service Vulnerability in Microsoft.Native.Quic.MsQuic.Schannel","description":"### Impact\nThe MsQuic server application or process will crash, resulting in a denial of service.\n\n### Patches\nThe following patch was made:\n\n- Don't Allow Version Negotiation Packets for Server Connections - https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343\n\n### Workarounds\nBeyond upgrading to the patched versions, there is no other workaround. You must upgrade or disable MsQuic functionality.\n","status":"published","published":"2023-10-10T21:23:27Z","modified":"2024-06-03T18:35:11Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400","CWE-476"],"updated_at":"2026-11-02T14:37:53.025064Z"}],"nvd":[{"id":"CVE-2023-38171","description":"Microsoft QUIC Denial of Service Vulnerability","status":"published","published":"2023-10-10T18:15:18.087Z","modified":"2026-06-17T06:09:35.327Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:08:36.656095Z"}],"osv":[{"id":"ALPINE-CVE-2023-38171","description":"Microsoft QUIC Denial of Service Vulnerability","status":"published","published":"2023-10-10T18:15:18.087Z","modified":"2026-11-03T06:32:43.060064028Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T07:17:02.90744Z"},{"id":"CVE-2023-38171","description":"Microsoft QUIC Denial of Service Vulnerability","status":"published","published":"2023-10-10T18:15:18.087Z","modified":"2026-10-24T10:30:52.49285359Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:32.922049Z"},{"id":"GHSA-xh5m-8qqp-c5x7","title":"Remote Denial of Service Vulnerability in Microsoft.Native.Quic.MsQuic.Schannel","description":"### Impact\nThe MsQuic server application or process will crash, resulting in a denial of service.\n\n### Patches\nThe following patch was made:\n\n- Don't Allow Version Negotiation Packets for Server Connections - https://github.com/microsoft/msquic/commit/3226cff07d22662f16fc98d605656860e64cd343\n\n### Workarounds\nBeyond upgrading to the patched versions, there is no other workaround. You must upgrade or disable MsQuic functionality.\n","status":"published","published":"2023-10-10T21:23:27Z","modified":"2024-06-03T18:46:58.32847Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400","CWE-476"],"updated_at":"2026-11-02T15:46:59.835583Z"},{"id":"BIT-dotnet-2023-38171","title":"Microsoft QUIC Denial of Service Vulnerability","description":"Microsoft QUIC Denial of Service Vulnerability","status":"published","published":"2024-03-06T10:52:42.705Z","modified":"2026-09-08T08:46:56.211205901Z","updated_at":"2026-11-02T15:28:29.152062Z"},{"id":"BIT-dotnet-sdk-2023-38171","title":"Microsoft QUIC Denial of Service Vulnerability","description":"Microsoft QUIC Denial of Service Vulnerability","status":"published","published":"2024-03-06T10:52:40.09Z","modified":"2026-09-08T08:46:44.351570952Z","updated_at":"2026-11-02T15:28:29.152062Z"}]}}