CVE-2020-1045

dotnet: ASP.NET cookie prefix spoofing vulnerability

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Severity

Important

Red Hat Product Security

7.5

CVSS 3.1

Review impact separately from score.

Published · July 1, 2020

Updated · February 24, 2026

Description

A flaw was found in ASP.NET. Certain cookie values are not properly decoded allowing a remote attacker to bypass the "Cookie Prefixes" security mechanism. The highest threat from this vulnerability is to data integrity.

Statement

The "Cookie Prefixes" feature is not used by default in ASP.NET. Successful exploitation likely requires a secondary vulnerability, for example a cross-site scripting issue.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CWE-807 · Reliance on Untrusted Inputs in a Security Decision