CVE-2020-1045

7.5 HIGH
Published: September 11, 2020 Modified: February 23, 2026
View on NVD

Description

<p>A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.</p> <p>The 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.</p> <p>The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.</p>

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:3699
Source: secure@microsoft.com
Third Party Advisory
https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md#changes-in-318
Source: secure@microsoft.com
Release Notes Third Party Advisory
https://security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600
Source: secure@microsoft.com
Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:3699
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md#changes-in-318
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Third Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Vendor Advisory
https://security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

12 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.5 / 10.0
EPSS (Exploit Probability)
20.4%
95th percentile
Exploitation Status
Not in CISA KEV

Affected Vendors

redhat fedoraproject microsoft