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ASP.NET Core

CVE-2026-45591 — ASP.NET Core Denial of Service Vulnerability

Important CVSS 7.5 EPSS 0.0075 2026-06 archive

Executive Summary

Uncontrolled resource consumption in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Overview

7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Denial of Service
Weakness CWE-400: Uncontrolled Resource Consumption
Released Jun 9 2026
Last Updated Jun 9 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.0075 — 0.50077 percentile
NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.5

EPSS Score

0.0075
probability of exploitation in the next 30 days
0.50077 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

13 affected products
Product KB Article Severity Impact Restart Required
.NET 10.0 installed on Linux 5097148 (Security Update) Important Denial of Service Maybe
.NET 10.0 installed on Mac OS 5097148 (Security Update) Important Denial of Service Maybe
.NET 10.0 installed on Windows 5097148 (Security Update) Important Denial of Service Maybe
.NET 8.0 installed on Linux 5097149 (Security Update) Important Denial of Service Maybe
.NET 8.0 installed on Mac OS 5097149 (Security Update) Important Denial of Service Maybe
.NET 8.0 installed on Windows 5097149 (Security Update) Important Denial of Service Maybe
.NET 9.0 installed on Linux 5097150 (Security Update) Important Denial of Service Maybe
.NET 9.0 installed on Mac OS 5097150 (Security Update) Important Denial of Service Maybe
.NET 9.0 installed on Windows 5097150 (Security Update) Important Denial of Service Maybe
ASP.NET Core 10.0 5097148 (Security Update) Important Denial of Service Maybe
ASP.NET Core 8.0 5097149 (Security Update) Important Denial of Service Maybe
ASP.NET Core 9.0 5097150 (Security Update) Important Denial of Service Maybe
Microsoft Visual Studio 2026 version 18.6 Release Notes (Security Update) Important Denial of Service Maybe

Patches

4 patches
Article Type Restart
5097148 Security Update Maybe
5097149 Security Update Maybe
5097150 Security Update Maybe
Release Notes Security Update Maybe

Known Exploits

Acknowledgments

Anonymous

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