CVE-2020-1045 HIGH

CVE-2020-1045: Microsoft ASP.NET Core Security Feature Bypass Vulnerability

Vendor Microsoft
Product ASP.NET Core 2.1
Published September 11, 2020
Last update November 18, 2024

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity High

CVSS 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

What the vulnerability does

01Description

<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>

Key dates

02Disclosure timeline

September 11, 2020 CVE published
November 18, 2024 Record updated