Microsoft .NET Framework Information Disclosure Vulnerability (CVE-2024-29059) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSystems running affected versions of Microsoft .NET Framework and .NET Core, particularly within IIS or web application server environments.
Unauthenticated remote attackers can trigger specific exceptions to obtain sensitive debugging information, including internal system paths and memory states.
Apply the official Microsoft cumulative security updates immediately and disable detailed error messages in the web.config configuration.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the latest cumulative security updates provided by Microsoft. You can force Windows Update to retrieve and install the relevant KB patches using PowerShell.
# Install Windows Update module and apply the security patches
Install-Module PSWindowsUpdate -Force -Verbose
Get-WindowsUpdate -KBArticleID KB5038283, KB5038285 -Install -AcceptAll -AutoReboot2. Temporary Workaround & Hardening Configuration
If patching cannot be performed immediately, modify the application's web.config file to prevent detailed error messages from being sent to remote users.
<!-- Apply this configuration within the <system.web> section of your web.config -->
<configuration>
<system.web>
<customErrors mode='RemoteOnly' defaultRedirect='~/Error.html'>
<error statusCode='500' redirect='~/InternalError.html'/>
</customErrors>
<compilation debug='false' targetFramework='4.8' />
</system.web>
</configuration>3. Log Audit & IoC Verification Commands
Verify the installed .NET Framework version via the registry and inspect IIS logs for anomalous HTTP 500 internal server errors.
# Check the installed .NET Framework release version via Registry
Get-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full' -Name Release | Select-Object Release
# Scan IIS logs for excessive HTTP 500 status codes indicating potential exploitation attempts
Select-String -Path 'C:\inetpub\logs\LogFiles\W3SVC1\*.log' -Pattern ' 500 ' | Select-Object -First 20Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2024-29059) is a high-severity information disclosure vulnerability in Microsoft .NET Framework. Classified under CWE-209 (Information Exposure Through Error Message), the root cause lies in the improper handling of system exceptions within the .NET runtime. When certain error conditions are met, the runtime fails to sanitize the output, exposing sensitive debugging details such as call stacks, internal file paths, and environment variables directly to the client.
2. Exploitation Mechanics & Attack Scenario
An unauthenticated remote attacker can exploit this vulnerability by sending specially crafted HTTP requests designed to trigger internal application exceptions. If the target application is configured with debugging enabled or lacks robust global exception handling, the server responds with a detailed error page. The attacker analyzes this response to map the internal directory structure, identify library versions, and extract configuration details, which serves as critical reconnaissance for subsequent high-impact attacks. This vulnerability is actively exploited in the wild and is listed in the CISA KEV catalog.
3. Infrastructure & Business Impact
Successful exploitation compromises the confidentiality of the application infrastructure. With an EPSS score of 0.9862 (98.62%), this vulnerability is highly targeted by automated scanning tools and threat actors. Exposing internal system paths and configuration details significantly lowers the barrier for attackers to execute secondary attacks, potentially leading to compliance violations and loss of customer trust.
Official Vendor Advisories & References
.NET Framework Information Disclosure Vulnerability
Frequently Asked SecOps Questions (CVE-2024-29059)
FAQQ1. How critical is CVE-2024-29059 and is it actively exploited in the wild?
CVE-2024-29059 is rated CVSS 7.5 (HIGH) with a 30-day EPSS exploitation probability of 98.6%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2024-29059?
Primary impacted vendors include microsoft across .net framework. Scope summary: All supported versions of Microsoft .NET Framework including 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, and 4.8.1 running on IIS or web hosting environments.
Q3. What temporary mitigations or workarounds exist for CVE-2024-29059 before patching?
[Mitigation] Apply the official Microsoft cumulative security updates immediately and disable detailed error messages in the web.config configuration. 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-2024-29059
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
🔗 Related Advisories in Similar Stack (microsoft)
View Category →Microsoft Windows Shell Command Injection and Security Feature Bypass (CVE-2026-96951) Advisory
[Affected Scope] All supported versions of Windows OS including Windows 10, 11, and Windows Server.
Microsoft Windows Shell Security Feature Bypass Vulnerability (CVE-2026-21510) Urgent Security Advisory
[Affected Scope] Windows Shell component across Microsoft Windows operating systems
Windows ALPC Heap-Based Buffer Overflow Privilege Escalation Vulnerability (CVE-2026-85880) Security Advisory
[Affected Scope] Locally authenticated users across Microsoft Windows operating systems
Windows Update Stack Privilege Escalation Vulnerability via Link Following (CVE-2026-81963) Technical Advisory
[Affected Scope] Microsoft Windows operating systems utilizing the Windows Update Stack
Subscribe to Daily Vulnerability Briefings & KEV Alerts
Concise morning briefings for SecOps, DevSecOps, and SRE teams covering newly exploited CVEs and mitigation priorities.