CVE-2021-41355 .NET Core and Visual Studio Information Disclosure Vulnerability
Medium 5.7
Published
Updated
Check this codebase for CVE-2021-41355 and fix it if it is affected.
What it is: CVE-2021-41355 is a medium-severity vulnerability in Microsoft .Net, published on 13 Oct 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-41355 in the wild and no public exploit code.
Affected packages and fixed versions:
- System.DirectoryServices.Protocols (NuGet): affected all versions; fixed in 5.0.1
- System.DirectoryServices.Protocols (NuGet): affected all versions; fixed in 5.0.1
- dotnet (Bitnami): affected from 5.0.0; fixed in 5.0.1
- dotnet-sdk (Bitnami): affected from 5.0.0; fixed in 5.0.1
- powershell (Bitnami): affected from 7.1.0; fixed in 7.1.5
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-41355/ (Markdown: https://insights.sbomify.com/CVE-2021-41355/index.md)
An information disclosure vulnerability in .NET Core and Visual Studio allows attackers to read sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-41355?
CVE-2021-41355 is a medium-severity vulnerability in Microsoft .Net, published on 13 Oct 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
.NET Core and Visual Studio Information Disclosure Vulnerability
Which versions are affected by CVE-2021-41355?
5 open source packages ship an affected version, including System.DirectoryServices.Protocols, dotnet and dotnet-sdk. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
System.DirectoryServices.Protocols NuGet | All versions | 5.0.1 |
System.DirectoryServices.Protocols NuGet | All versions | 5.0.1 |
dotnet Bitnami | From 5.0.0 | 5.0.1 |
dotnet-sdk Bitnami | From 5.0.0 | 5.0.1 |
powershell Bitnami | From 7.1.0 | 7.1.5 |
Linux distribution packages (35)
aspnetcore-runtime-5.0 AlmaLinux:8 | All versions | 5.0.11-1.el8_4 |
aspnetcore-targeting-pack-5.0 AlmaLinux:8 | All versions | 5.0.11-1.el8_4 |
dotnet-apphost-pack-5.0 AlmaLinux:8 | All versions | 5.0.11-1.el8_4 |
dotnet-hostfxr-5.0 AlmaLinux:8 | All versions | 5.0.11-1.el8_4 |
dotnet-runtime-5.0 AlmaLinux:8 | All versions | 5.0.11-1.el8_4 |
dotnet-sdk-5.0 AlmaLinux:8 | All versions | 5.0.208-1.el8_4 |
dotnet-targeting-pack-5.0 AlmaLinux:8 | All versions | 5.0.11-1.el8_4 |
dotnet-templates-5.0 AlmaLinux:8 | All versions | 5.0.208-1.el8_4 |
aspnetcore-runtime-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
aspnetcore-targeting-pack-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.208-1.el8_4 |
dotnet-apphost-pack-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-apphost-pack-5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-host Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-host-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-hostfxr-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-hostfxr-5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-runtime-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-runtime-5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-sdk-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.208-1.el8_4 |
dotnet-sdk-5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.208-1.el8_4 |
dotnet-targeting-pack-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.11-1.el8_4 |
dotnet-templates-5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.208-1.el8_4 |
dotnet5.0 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.208-1.el8_4 |
dotnet5.0-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.208-1.el8_4 |
dotnet5.0-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.208-1.el8_4 |
netstandard-targeting-pack-2.1 Red Hat:enterprise_linux:8::appstream | All versions | 0:5.0.208-1.el8_4 |
rh-dotnet50-aspnetcore-runtime-5.0 Red Hat:rhel_dotnet:5.0::el7 | All versions | 0:5.0.11-1.el7_9 |
rh-dotnet50-aspnetcore-targeting-pack-5.0 Red Hat:rhel_dotnet:5.0::el7 | All versions | 0:5.0.11-1.el7_9 |
rh-dotnet50-dotnet Red Hat:rhel_dotnet:5.0::el7 | All versions | 0:5.0.208-1.el7_9 |
rh-dotnet50-dotnet-apphost-pack-5.0 Red Hat:rhel_dotnet:5.0::el7 | All versions | 0:5.0.11-1.el7_9 |
rh-dotnet50-dotnet-debuginfo Red Hat:rhel_dotnet:5.0::el7 | All versions | 0:5.0.208-1.el7_9 |
rh-dotnet50-dotnet-host Red Hat:rhel_dotnet:5.0::el7 | All versions | 0:5.0.11-1.el7_9 |
rh-dotnet50-dotnet-hostfxr-5.0 Red Hat:rhel_dotnet:5.0::el7 | All versions | 0:5.0.11-1.el7_9 |
rh-dotnet50-dotnet-runtime-5.0 Red Hat:rhel_dotnet:5.0::el7 | All versions | 0:5.0.11-1.el7_9 |
Products include Microsoft .Net, Microsoft Powershell, Microsoft Visual Studio 2019.
How do I fix CVE-2021-41355?
Upgrade System.DirectoryServices.Protocols to 5.0.1 or later.
Is CVE-2021-41355 being exploited?
There is no known exploitation of CVE-2021-41355 in the wild and no public exploit code.
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- CVE-2026-96957 .NET Security Feature Bypass Vulnerability
- CVE-2026-69439 .NET and Visual Studio Elevation of Privilege Vulnerability
- CVE-2026-71328 .NET and Visual Studio Remote Code Execution Vulnerability
Sources
Also known as ALSA-2021:3819, BIT-dotnet-2021-41355, BIT-dotnet-sdk-2021-41355, BIT-powershell-2021-41355, GHSA-9cxh-gqpx-qc5m, RHSA-2021:3818 and 1 more.