CVE-2023-33127 is a high-severity security vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-arm64 (nuget), affecting versions >= 7.0.0, < 7.0.9. It is fixed in 7.0.9, 6.0.20.
Microsoft Security Advisory CVE-2023-33127: .NET Remote Code Execution Vulnerability <a name="executive-summary"></a>Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 7.0 and .NET 6.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A vulnerability exists in .NET applications where the diagnostic server can be exploited to achieve cross-session/cross-user elevation of privilege (EoP) and code execution. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/263 <a name="mitigation-factors"></a>Mitigation factors Microsoft has not identified any mitigating factors for this vulnerability. <a name="affected-software"></a>Affected software Any .NET 7.0 application running on .NET 7.0.8 or earlier. Any .NET 6.0 application running on .NET 6.0.19 or earlier. If your application uses the following package versions, ensure you update to the latest version of .NET. <a name=".NET 7"></a>.NET 7 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 7.0.0, <= 7.0.8 | 7.0.9 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 7.0.0, <= 7.0.8 | 7.0.9 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 7.0.0, <= 7.0.8 | 7.0.9 <a name=".NET 6"></a>.NET 6 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.WindowsDesktop.App.Runtime.win-arm64 | >= 6.0.0, <= 6.0.19 | 6.0.20 Microsoft.WindowsDesktop.App.Runtime.win-x64 | >= 6.0.0, <= 6.0.19 | 6.0.20 Microsoft.WindowsDesktop.App.Runtime.win-x86 | >= 6.0.0, <= 6.0.19 | 6.0.20 Advisory FAQ <a name="how-affected"></a>How do I know if I am affected? If you have a runtime or SDK with a version listed, or an affected package listed in affected software, you're exposed to the vulnerability. <a name="how-fix"></a>How do I fix the issue? To fix the issue please install the latest version of .NET 6.0 or .NET 7.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs. If you are using one of the affected packages, please update to the patched version listed above. If you have .NET 6.0 or greater installed, you can list the versions you have installed by running the dotnet --info command. You will see output like the following; If you're using .NET 7.0, you should download and install Runtime 7.0.8 or SDK 7.0.109 (for Visual Studio 2022 v17.4) from https://dotnet.microsoft.com/download/dotnet-core/7.0. If you're using .NET 6.0, you should download and install Runtime 6.0.19 or SDK 6.0.315 (for Visual Studio 2022 v17.2) from https://dotnet.microsoft.com/download/dotnet-core/6.0. .NET 6.0 and and .NET 7.0 updates are also available from Microsoft Update. To access this either type "Check for updates" in your Windows search, or open Settings, choose Update & Security and then click Check for Updates. Once you have installed the updated runtime or SDK, restart your apps for the update to take effect. Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed. Other Information Reporting Security Issues If you have found a potential security issue in .NET 6.0 or .NET 7.0, please email details to [email protected]. Reports may qualify for the Microsoft .NET Core & .NET 5 Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at <https://aka.ms/corebounty>. Support You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime and https://github.com/dotnet/aspnet/. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue. Disclaimer The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. External Links CVE-2023-33127 Revisions V1.0 (July 11, 2023): Advisory published. Version 1.0 Last Updated 2023-07-11
CVE-2023-33127 has a CVSS score of 8.1 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (7.0.9, 6.0.20). Upgrading removes the vulnerable code path.
nuget
Microsoft.WindowsDesktop.App.Runtime.win-arm64 (>= 7.0.0, < 7.0.9)Microsoft.WindowsDesktop.App.Runtime.win-arm64 (>= 6.0.0, < 6.0.20)Microsoft.WindowsDesktop.App.Runtime.win-x64 (>= 7.0.0, < 7.0.9)Microsoft.WindowsDesktop.App.Runtime.win-x64 (>= 6.0.0, < 6.0.20)Microsoft.WindowsDesktop.App.Runtime.win-x86 (>= 6.0.0, < 6.0.20)Microsoft.WindowsDesktop.App.Runtime.win-x86 (>= 7.0.0, < 7.0.9)Microsoft.WindowsDesktop.App.Runtime.win-arm64 → 7.0.9 (nuget)Microsoft.WindowsDesktop.App.Runtime.win-arm64 → 6.0.20 (nuget)Microsoft.WindowsDesktop.App.Runtime.win-x64 → 7.0.9 (nuget)Microsoft.WindowsDesktop.App.Runtime.win-x64 → 6.0.20 (nuget)Microsoft.WindowsDesktop.App.Runtime.win-x86 → 6.0.20 (nuget)Microsoft.WindowsDesktop.App.Runtime.win-x86 → 7.0.9 (nuget)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
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Upgrade the following packages to resolve this vulnerability:
Microsoft.WindowsDesktop.App.Runtime.win-arm64 to 7.0.9 or laterMicrosoft.WindowsDesktop.App.Runtime.win-arm64 to 6.0.20 or laterMicrosoft.WindowsDesktop.App.Runtime.win-x64 to 7.0.9 or laterMicrosoft.WindowsDesktop.App.Runtime.win-x64 to 6.0.20 or laterMicrosoft.WindowsDesktop.App.Runtime.win-x86 to 6.0.20 or laterMicrosoft.WindowsDesktop.App.Runtime.win-x86 to 7.0.9 or laterKodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2023-33127 is a high-severity security vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-arm64 (nuget), affecting versions >= 7.0.0, < 7.0.9. It is fixed in 7.0.9, 6.0.20.
CVE-2023-33127 has a CVSS score of 8.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Microsoft.WindowsDesktop.App.Runtime.win-arm64 (nuget) (versions >= 7.0.0, < 7.0.9)Microsoft.WindowsDesktop.App.Runtime.win-x64 (nuget) (versions >= 7.0.0, < 7.0.9)Microsoft.WindowsDesktop.App.Runtime.win-x86 (nuget) (versions >= 6.0.0, < 6.0.20)Yes. CVE-2023-33127 is fixed in 7.0.9, 6.0.20. Upgrade to this version or later.
Whether CVE-2023-33127 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Microsoft.WindowsDesktop.App.Runtime.win-arm64 to 7.0.9 or laterMicrosoft.WindowsDesktop.App.Runtime.win-arm64 to 6.0.20 or laterMicrosoft.WindowsDesktop.App.Runtime.win-x64 to 7.0.9 or laterMicrosoft.WindowsDesktop.App.Runtime.win-x64 to 6.0.20 or laterMicrosoft.WindowsDesktop.App.Runtime.win-x86 to 6.0.20 or laterMicrosoft.WindowsDesktop.App.Runtime.win-x86 to 7.0.9 or later