# CVE-2022-21911: .NET Framework Denial of Service Vulnerability

> An attacker can cause a denial of service in applications using Microsoft .NET Framework by exploiting a vulnerability in the framework.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/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:** No
- **Published:** 11 Jan 2022
- **Updated:** 2 Jan 2025
- **Also known as:** GHSA-hjxm-5f5m-prmm

## What is CVE-2022-21911?

CVE-2022-21911 is a high-severity denial of service vulnerability in Microsoft .Net Framework, published on 11 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

.NET Framework Denial of Service Vulnerability

## Which versions are affected by CVE-2022-21911?

It affects 1 product.


Products: Microsoft .Net Framework.

## How do I fix CVE-2022-21911?

No fix has been published for CVE-2022-21911 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-21911 being exploited?

There is no known exploitation of CVE-2022-21911 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft .Net Framework

- [CVE-2020-0646](https://insights.sbomify.com/CVE-2020-0646/): Microsoft .NET Framework Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-8759](https://insights.sbomify.com/CVE-2017-8759/): Microsoft .NET Framework Remote Code Execution (high 7.8, exploited in the wild)
- [CVE-2015-1671](https://insights.sbomify.com/CVE-2015-1671/): Microsoft Windows Remote Code Execution (high 7.8, exploited in the wild)
- [CVE-2024-29059](https://insights.sbomify.com/CVE-2024-29059/): Microsoft .NET Framework Information Disclosure (high 7.5, exploited in the wild)
- [CVE-2014-4073](https://insights.sbomify.com/CVE-2014-4073/): Privilege escalation in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-21911 and fix it if it is affected.

What it is: CVE-2022-21911 is a high-severity denial of service vulnerability in Microsoft .Net Framework, published on 11 Jan 2022. 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-2022-21911 in the wild and no public exploit code.

Affected product: Microsoft .Net Framework. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2022-21911/ (Markdown: https://insights.sbomify.com/CVE-2022-21911/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-21911
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-21911
- OSV: https://osv.dev/vulnerability/CVE-2022-21911

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-21911/
Summaries are generated and may contain mistakes; the official description above is the record.