CVE-2020-0602 Denial of service in ASP.NET Core
High 7.5
Published
Updated
Check this codebase for CVE-2020-0602 and fix it if it is affected.
What it is: CVE-2020-0602 is a high-severity denial of service vulnerability in Redhat Enterprise Linux, published on 14 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-0602 in the wild and no public exploit code.
Affected packages and fixed versions:
- Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): affected from 3.1.0; fixed in 3.1.1
- Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): affected from 3.1.0; fixed in 3.1.1
- aspnet-core (Bitnami): affected from 2.1.0; fixed in 2.1.1, 3.0.1, 3.1.1
- Microsoft.AspNetCore.All (NuGet): affected from 2.1.0; fixed in 2.1.15
- Microsoft.AspNetCore.All (NuGet): affected from 2.1.0; fixed in 2.1.15
- Microsoft.AspNetCore.App (NuGet): affected from 2.1.0; fixed in 2.1.15
- Microsoft.AspNetCore.App (NuGet): affected from 2.1.0; fixed in 2.1.15
- Microsoft.AspNetCore.App (NuGet): affected from 3.0.0; fixed in 3.0.1
- Microsoft.AspNetCore.App (NuGet): affected from 3.0.0; fixed in 3.0.1
- Microsoft.AspNetCore.App (NuGet): affected from 3.1.0; fixed in 3.1.1
- Microsoft.AspNetCore.App (NuGet): affected from 3.1.0; fixed in 3.1.1
- Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): affected from 3.1.0; fixed in 3.1.1
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-2020-0602/ (Markdown: https://insights.sbomify.com/CVE-2020-0602/index.md)
Attackers can cause a denial of service by sending improperly handled web requests to ASP.NET Core applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-0602?
CVE-2020-0602 is a high-severity denial of service vulnerability in Redhat Enterprise Linux, published on 14 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A denial of service vulnerability exists when ASP.NET Core improperly handles web requests, aka 'ASP.NET Core Denial of Service Vulnerability'.
Which versions are affected by CVE-2020-0602?
27 open source packages ship an affected version, including Microsoft.AspNetCore.App.Runtime.linux-arm, aspnet-core and Microsoft.AspNetCore.All. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
Microsoft.AspNetCore.App.Runtime.linux-arm NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.linux-arm NuGet | From 3.1.0 | 3.1.1 |
aspnet-core Bitnami | From 2.1.0 | 2.1.1, 3.0.1, 3.1.1 |
Microsoft.AspNetCore.All NuGet | From 2.1.0 | 2.1.15 |
Microsoft.AspNetCore.All NuGet | From 2.1.0 | 2.1.15 |
Microsoft.AspNetCore.App NuGet | From 2.1.0 | 2.1.15 |
21 more packages
Microsoft.AspNetCore.App NuGet | From 2.1.0 | 2.1.15 |
Microsoft.AspNetCore.App NuGet | From 3.0.0 | 3.0.1 |
Microsoft.AspNetCore.App NuGet | From 3.0.0 | 3.0.1 |
Microsoft.AspNetCore.App NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.linux-arm64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.linux-arm64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.linux-musl-x64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.linux-musl-x64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.linux-x64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.linux-x64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.osx-x64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.osx-x64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.win-arm NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.win-arm NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.win-x64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.win-x64 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.win-x86 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.App.Runtime.win-x86 NuGet | From 3.1.0 | 3.1.1 |
Microsoft.AspNetCore.Http.Connections NuGet | From 1.0.0 | 1.0.15 |
Microsoft.AspNetCore.Http.Connections NuGet | From 1.0.0 | 1.0.15 |
Products include Microsoft Asp.net Core, Redhat Enterprise Linux, Redhat Enterprise Linux Eus.
How do I fix CVE-2020-0602?
Upgrade Microsoft.AspNetCore.App.Runtime.linux-arm to 3.1.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-0602 being exploited?
There is no known exploitation of CVE-2020-0602 in the wild and no public exploit code.
Other vulnerabilities in Redhat Enterprise Linux
- CVE-2025-55315 ASP.NET Security Feature Bypass Vulnerability
- CVE-2026-88092 ASP.NET Core Tampering Vulnerability
- CVE-2026-40372 ASP.NET Core Elevation of Privilege Vulnerability
- CVE-2021-43877 ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability
- CVE-2020-0603 Remote code execution in ASP.NET Core
Sources
Also known as BIT-aspnet-core-2020-0602, GHSA-23cv-jh4v-vffm.