{"id":"CVE-2020-1045","aliases":["BIT-aspnet-core-2020-1045","EUVD-2022-4249","GHSA-hxrm-9w7p-39cc","RHSA-2020:3697","RHSA-2020:3699"],"status":"published","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","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.05926,"percentile":0.93303,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2020-09-11T00:00:00Z","modified":"2026-10-24T10:50:36Z","fixes":[{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App","fixed_in":["2.1.22"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.Owin","fixed_in":["4.1.1"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-arm","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-arm64","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-musl-arm64","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-musl-x64","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.linux-x64","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.osx-x64","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.win-arm","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.win-x64","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.win-x86","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.App.Runtime.win-arm64","fixed_in":["3.1.8"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.AspNetCore.Http","fixed_in":["2.1.22"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"aspnet-core","fixed_in":["3.1.8"],"sources":["osv"]},{"ecosystem":"Red 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