Vulnerability Intelligence Report
Microsoft ASP.NET Core Security Feature Bypass Vulnerability
CVE-2020-1045
<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>
No Active Exploit Signals
CVSS Base Score
7.5
HIGH
Exploitability:3.9
Impact Score:3.6
EPSS Probability:6.62%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
—
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | ASP.NET Core 2.1 | 2.0 < publication (affected) |
| Microsoft | ASP.NET Core 3.1 | 3.0 < publication (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
6.624%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2019-11-04T00:00:00 |
| Published | 2020-09-11T00:00:00 |
| Patch Date | 2020-09-08 |
| Last Updated | 2024-11-18T16:25:38 |
Community Chatter & Buzz