{"id":"CVE-2020-1045","details":"\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\n","aliases":["BIT-aspnet-core-2020-1045","GHSA-hxrm-9w7p-39cc"],"modified":"2026-02-20T16:37:45.434358Z","published":"2020-09-11T17:15:18.307Z","references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LN2FUVBSVPGK7AU3NMLO3YR6CGONQPB/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ASICXQXS4M7MTAF6SGQMCLCA63DLCUT3/"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2020:3699"},{"type":"ADVISORY","url":"https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md#changes-in-318"},{"type":"ADVISORY","url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045"},{"type":"ADVISORY","url":"https://security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600"},{"type":"FIX","url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dotnet/aspnetcore","events":[{"introduced":"03019875e4eab279a99ba3ba5ee75fb0e4935ce6"},{"fixed":"c75b3f7a2fb9fe21fd96c93c070fdfa88a2fbe97"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-1045.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}