ASP.NET
CVE-2020-0603 — ASP.NET Core Remote Code Execution Vulnerability
Executive Summary
A remote code execution vulnerability exists in ASP.NET Core software when the software fails to handle client deleted connections. An attacker who successfully exploited the vulnerability could run arbitrary code in memory on the server. Exploitation of the vulnerability requires that a user perform certain actions during the connection process. The security update addresses the vulnerability by correcting how ASP.NET Core handles deleted connections.
Overview
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
EPSS Score
0.19982
probability of exploitation in the next 30 days
0.97101 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
3 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| ASP.NET Core 2.1 | Release Notes (Security Update) |
Critical | Remote Code Execution | Maybe |
| ASP.NET Core 3.0 | Release Notes (Security Update) |
Critical | Remote Code Execution | Maybe |
| ASP.NET Core 3.1 | Release Notes (Security Update) |
Critical | Remote Code Execution | Maybe |
Patches
1 patch
| Article | Type | Restart |
|---|---|---|
Release Notes |
Security Update | Maybe |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Brennan Conroy of Microsoft Corporation
References
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