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CVE-2020-1045

nvd nist
Published: Sep 11, 2020Modified: Jun 17, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Exploitability: 3.9 / Impact: 3.6
Source: NVD (Secondary)

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>

Affected (14)

1 product
Asp.net Core
1 product
Fedora
4 products
Enterprise Linux
Enterprise Linux Aus
Enterprise Linux Eus
Enterprise Linux Tus
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Microsoft
From 2.1 to 2.1.21
From 3.1 to 3.1.8
Configuration B
2 vulnerable
Vulnerable SoftwareAffected Versions
Fedoraproject
Version 32
Version 33
Configuration C
10 vulnerable
Vulnerable SoftwareAffected Versions
Version 8.0
Redhat
Version 8.2
Version 8.4
Version 8.6
Redhat
Version 8.2
Version 8.4
Version 8.6
Redhat
Version 8.2
Version 8.4
Version 8.6

References (12)

Source: secure@microsoft.com
Third Party Advisory
Source: secure@microsoft.com
Release NotesThird Party Advisory
Source: secure@microsoft.com
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Release NotesThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

Timeline

No history available yet.