# CVE-2023-33141: Yet Another Reverse Proxy (YARP) Denial of Service Vulnerability

> Attackers can cause a denial of service in the YARP reverse proxy library, affecting applications using this Microsoft NuGet package.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Jun 2023
- **Updated:** 1 Jan 2025
- **Also known as:** GHSA-jrjw-qgr2-wfcg

## What is CVE-2023-33141?

CVE-2023-33141 is a high-severity denial of service vulnerability in Microsoft YARP 1.0, published on 23 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Yet Another Reverse Proxy (YARP) Denial of Service Vulnerability

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2023-33141?

4 open source packages ship an affected version, including Yarp.ReverseProxy. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `Yarp.ReverseProxy` | NuGet | All versions | 1.1.2 |
| `Yarp.ReverseProxy` | NuGet | All versions | 1.1.2 |
| `Yarp.ReverseProxy` | NuGet | From 2.0.0 | 2.0.1 |
| `Yarp.ReverseProxy` | NuGet | From 2.0.0 | 2.0.1 |

Products: Microsoft Yet Another Reverse Proxy.

## How do I fix CVE-2023-33141?

Upgrade Yarp.ReverseProxy to a fixed version for your release line: 1.1.2 or 2.0.1.

## Is CVE-2023-33141 being exploited?

There is no known exploitation of CVE-2023-33141 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft YARP 1.0

- [CVE-2022-26924](https://insights.sbomify.com/CVE-2022-26924/): YARP Denial of Service Vulnerability (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-33141 and fix it if it is affected.

What it is: CVE-2023-33141 is a high-severity denial of service vulnerability in Microsoft YARP 1.0, published on 23 Jun 2023. 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-2023-33141 in the wild and no public exploit code.

Affected packages and fixed versions:
- Yarp.ReverseProxy (NuGet): affected all versions; fixed in 1.1.2
- Yarp.ReverseProxy (NuGet): affected all versions; fixed in 1.1.2
- Yarp.ReverseProxy (NuGet): affected from 2.0.0; fixed in 2.0.1
- Yarp.ReverseProxy (NuGet): affected from 2.0.0; fixed in 2.0.1

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-2023-33141/ (Markdown: https://insights.sbomify.com/CVE-2023-33141/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-33141
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-33141
- OSV: https://osv.dev/vulnerability/CVE-2023-33141

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-33141/
Summaries are generated and may contain mistakes; the official description above is the record.