Microsoft .NET and Visual Studio Remote Denial of Service Vulnerability (CVE-2023-38180) Analysis & Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENT.NET 6.0, .NET 7.0, ASP.NET Core, and Microsoft Visual Studio 2022 environments
Unauthenticated remote attackers can trigger resource exhaustion (CPU/Memory) via crafted HTTP requests, leading to a complete Denial of Service (DoS)
Immediately update the .NET SDK/Runtime and Visual Studio to the latest patched versions
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Update your .NET SDK and Runtime to the latest secure versions on your host and container environments.
# Update .NET SDK and Runtime on Linux (Ubuntu/Debian)
sudo apt-get update && sudo apt-get install --only-upgrade -y dotnet-sdk-6.0 dotnet-runtime-6.0 dotnet-sdk-7.0 dotnet-runtime-7.0
# Ensure Dockerfiles use the latest patched base images
# Example: mcr.microsoft.com/dotnet/aspnet:7.0-alpine2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, configure a reverse proxy (Nginx, IIS) or WAF to limit concurrent connections and request rates to mitigate potential DoS attempts.
# Nginx configuration to limit connection and request rates
limit_conn_zone $binary_remote_addr zone=addr:10m;
limit_req_zone $binary_remote_addr zone=one:10m rate=10r/s;
server {
listen 80;
server_name app.local;
location / {
limit_conn addr 10;
limit_req zone=one burst=20 nodelay;
proxy_pass http://dotnet_backend_upstream;
}
}3. Log Audit & IoC Verification Commands
Verify the currently installed and running .NET versions on your system to identify vulnerable deployments.
# Check installed .NET Framework versions on Windows via PowerShell
Get-ChildItem 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP' -Recurse |
Get-ItemProperty -Name Version -ErrorAction SilentlyContinue |
Select-Object PSChildName, Version
# Check installed .NET Core/5/6/7 runtimes
dotnet --list-runtimesScan Your Repositories for Transitive Vulnerable Dependencies in 30 Seconds
Automatically detect vulnerable packages across npm, PyPI, Maven, and Go, and open automated fix Pull Requests without breaking your build.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2023-38180) is a high-severity Denial of Service (DoS) vulnerability affecting Microsoft .NET and Visual Studio. The root cause lies in improper resource management (CWE-400) within the HTTP request processing pipeline. Specifically, when ASP.NET Core's Kestrel web server or HTTP/2 and HTTP/3 protocol handlers process specially crafted request streams, they fail to release allocated resources properly, leading to infinite loops or severe memory/CPU exhaustion.
2. Exploitation Mechanics & Attack Scenario
An attacker can exploit this vulnerability by sending a sequence of maliciously crafted HTTP requests or maintaining persistent, malformed streams to the target .NET web application. Because the server's protocol parser fails to handle these exceptions gracefully, a single thread can consume 100% CPU capacity, or memory leaks can occur that bypass Garbage Collection (GC). This vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild.
3. Infrastructure & Business Impact
Successful exploitation of this vulnerability immediately degrades or halts the availability of external-facing web services, API gateways, and microservices running on .NET containers. This can result in business disruption, SLA breaches, and unexpected cloud infrastructure costs due to auto-scaling triggers trying to handle the artificial resource spike.
Official Vendor Advisories & References
.NET and Visual Studio Denial of Service Vulnerability
Frequently Asked SecOps Questions (CVE-2023-38180)
FAQQ1. How critical is CVE-2023-38180 and is it actively exploited in the wild?
CVE-2023-38180 is rated CVSS 7.5 (HIGH) with a 30-day EPSS exploitation probability of 14.1%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2023-38180?
Primary impacted vendors include microsoft across .net, visual studio. Scope summary: .NET 6.0 (prior to 6.0.21), .NET 7.0 (prior to 7.0.10), ASP.NET Core, and Visual Studio 2022 (v17.2, v17.4, v17.6 unpatched versions)
Q3. What temporary mitigations or workarounds exist for CVE-2023-38180 before patching?
[Mitigation] Immediately update the .NET SDK/Runtime and Visual Studio to the latest patched versions Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2023-38180
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
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