# CVE-2023-21722: .NET Framework Denial of Service Vulnerability

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

- **Severity:** Medium 5.0 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Feb 2023
- **Updated:** 19 Aug 2026
- **Also known as:** GHSA-xp67-pj6p-rpvg

## What is CVE-2023-21722?

CVE-2023-21722 is a medium-severity denial of service vulnerability in Microsoft .Net Framework, published on 14 Feb 2023. 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 Framework Denial of Service Vulnerability

Weakness: CWE-59 (Improper Link Resolution Before File Access)

## Which versions are affected by CVE-2023-21722?

It affects 1 product.


Products: Microsoft .Net Framework.

## How do I fix CVE-2023-21722?

No fix has been published for CVE-2023-21722 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-21722 being exploited?

There is no known exploitation of CVE-2023-21722 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-2023-21722 and fix it if it is affected.

What it is: CVE-2023-21722 is a medium-severity denial of service vulnerability in Microsoft .Net Framework, published on 14 Feb 2023. 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-2023-21722 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-2023-21722/ (Markdown: https://insights.sbomify.com/CVE-2023-21722/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-21722
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-21722
- OSV: https://osv.dev/vulnerability/CVE-2023-21722

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-21722/
Summaries are generated and may contain mistakes; the official description above is the record.