# CVE-2019-0980: Denial of service in ASP.NET Core

> Attackers can cause a denial of service by sending improperly handled web requests to applications using .NET Framework or .NET Core.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 May 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-xhfc-gr8f-ffwc

## What is CVE-2019-0980?

CVE-2019-0980 is a high-severity denial of service vulnerability in Microsoft .Net Framework, published on 16 May 2019. 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 .NET Framework or .NET Core improperly handle web requests, aka '.Net Framework and .Net Core Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0820, CVE-2019-0981.

Weakness: CWE-19

## Which versions are affected by CVE-2019-0980?

2 open source packages ship an affected version, including System.Private.Uri. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `System.Private.Uri` | NuGet | From 4.3.0 | 4.3.2 |
| `System.Private.Uri` | NuGet | From 4.3.0 | 4.3.2 |

Products: Microsoft .Net Core, Microsoft .Net Framework.

## How do I fix CVE-2019-0980?

Upgrade System.Private.Uri to 4.3.2 or later.

## Is CVE-2019-0980 being exploited?

There is no known exploitation of CVE-2019-0980 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft .Net Framework

- [CVE-2020-1147](https://insights.sbomify.com/CVE-2020-1147/): Microsoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution (high 7.8, exploited in the wild)
- [CVE-2020-0605](https://insights.sbomify.com/CVE-2020-0605/): Code injection in .NET Core (high 8.8)
- [CVE-2020-0606](https://insights.sbomify.com/CVE-2020-0606/): Remote code execution in Microsoft.WindowsDesktop.App.Ref (high 8.8)
- [CVE-2019-1301](https://insights.sbomify.com/CVE-2019-1301/): High severity vulnerability that affects System.Management.Automation (high 7.5)
- [CVE-2019-0820](https://insights.sbomify.com/CVE-2019-0820/): Regular Expression Denial of Service in System.Text.RegularExpressions (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-0980 and fix it if it is affected.

What it is: CVE-2019-0980 is a high-severity denial of service vulnerability in Microsoft .Net Framework, published on 16 May 2019. 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-2019-0980 in the wild and no public exploit code.

Affected packages and fixed versions:
- System.Private.Uri (NuGet): affected from 4.3.0; fixed in 4.3.2
- System.Private.Uri (NuGet): affected from 4.3.0; fixed in 4.3.2

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-2019-0980/ (Markdown: https://insights.sbomify.com/CVE-2019-0980/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-0980
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-0980
- OSV: https://osv.dev/vulnerability/CVE-2019-0980

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-0980/
Summaries are generated and may contain mistakes; the official description above is the record.