WinDbg Vulnerability Allows Attackers to Execute Remote Code

Microsoft recently disclosed a critical vulnerability impacting its debugging tool, WinDbg, and associated .NET packages.

Tracked CVE-2025-24043, this flaw allows remote code execution (RCE) due to improper cryptographic signature verification in the SOS debugging extension.

According to Github’s Post, Developers using affected versions of specific NuGet packages within .NET Core projects are urged to update to the patched versions immediately.

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CVE Details: CVE-2025-24043

The vulnerability stems from inadequate verification of cryptographic signatures in the SOS component of WinDbg.

If exploited, this flaw lets authorized attackers execute malicious code remotely over a network.

Such an attack could compromise the confidentiality, integrity, and availability of affected systems, posing significant risks to organizations relying on these tools for development or debugging tasks.

Microsoft has rated the severity of this vulnerability as “High” under CVSS v3, emphasizing its potential impact on sensitive systems. Key metrics associated with CVSS scores include:

• Attack Vector: Network
• Privileges Required: Low
• User Interaction: None
• Confidentiality, Integrity, Availability Impact: High

The vulnerability has the identifier CVE-2025-24043 and its weakness aligns with CWE-347, which highlights improper cryptographic validation.

Affected Products

Organizations using any of these NuGet packages in their .NET Core projects need to evaluate and upgrade immediately:

1. dotnet-debugger-extensions
   • Affected versions: < 9.0.607601
   • Patched version: 9.0.607601
2. dotnet-dump
   • Affected versions: < 9.0.607501
   • Patched version: 9.0.607501
3. dotnet-sos
   • Affected versions: < 9.0.607501
   • Patched version: 9.0.607501

Mitigation Steps

Microsoft advises developers and organizations to take immediate action to reduce exposure to CVE-2025-24043:

1. Update NuGet Packages
   Replace references to vulnerable versions of dotnet-debugger-extensions, dotnet-dump, and dotnet-sos with their respective patched versions listed above.
2. Install Latest WinDbg
   Ensure that the debugging tool is updated to its latest version to prevent exploitation of the vulnerability.
3. Check Dependencies
   Review all application dependencies to confirm whether they reference vulnerable package versions.

Microsoft encourages users to report potential security issues by emailing secure@microsoft.com. Developers can also raise concerns or ask questions on GitHub within the .NET organization.

For more details about the advisory and bounty opportunities, visit Microsoft .NET Bounty Program.

The advisory provides guidance “as is” without warranties of any kind. Microsoft disclaims responsibility for any damages resulting from the use of this information.

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