CVE-2020-1045

high Microsoft
CVSS v3 Base Score
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS Score
20.4%
Exploitation probability in 30 days
Top 5% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
High
Availability
None
Published: September 11, 2020 (2071 days ago)
Last Modified: February 23, 2026
Vendor: Microsoft

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>

CWE

NVD-CWE-noinfo

Affected Products

microsoft asp.net corefedoraproject fedoraredhat enterprise linuxredhat enterprise linux ausredhat enterprise linux eusredhat enterprise linux tus

References

🔗 access.redhat.com 🔗 github.com 🔗 lists.fedoraproject.org 🔗 lists.fedoraproject.org 🔗 portal.msrc.microsoft.com