# CVE-2020-1046: .NET Framework Remote Code Execution Vulnerability

> An attacker can execute arbitrary code by uploading a specially crafted file to a web application using Microsoft .NET Framework.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-p734-hj82-4cvx

## What is CVE-2020-1046?

CVE-2020-1046 is a high-severity code injection vulnerability in Microsoft .Net Framework, published on 17 Aug 2020. 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

A remote code execution vulnerability exists when Microsoft .NET Framework processes input. An attacker who successfully exploited this vulnerability could take control of an affected system.
To exploit the vulnerability, an attacker would need to be able to upload a specially crafted file to a web application.
The security update addresses the vulnerability by correcting how .NET Framework processes input.

## Which versions are affected by CVE-2020-1046?

It affects 1 product.


Products: Microsoft .Net Framework.

## How do I fix CVE-2020-1046?

No fix has been published for CVE-2020-1046 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-1046 being exploited?

There is no known exploitation of CVE-2020-1046 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-2020-1046 and fix it if it is affected.

What it is: CVE-2020-1046 is a high-severity code injection vulnerability in Microsoft .Net Framework, published on 17 Aug 2020. 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-2020-1046 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-2020-1046/ (Markdown: https://insights.sbomify.com/CVE-2020-1046/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-1046
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-1046
- OSV: https://osv.dev/vulnerability/CVE-2020-1046

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-1046/
Summaries are generated and may contain mistakes; the official description above is the record.