# CVE-2021-26701: .NET Core Remote Code Execution Vulnerability

Source: https://junglewise.ai/threats/cve-2021-26701-net-core-remote-code-execution-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-04-21  
License: CC BY 4.0 with a link back

CVE-2021-26701 · Severity: low · CVSS 3.1 · Published 2021-04-21

.NET Core Remote Code Execution Vulnerability

Technologies: [System.Text.Encodings.Web (NuGet)](https://junglewise.ai/threats/technologies/system-text-encodings-web). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2021-26701 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-26701 being exploited in the wild.

**How severe is CVE-2021-26701?** Low severity, with a CVSS score of 3.1, published 21 April 2021.

**Which products and versions are affected?** System.Text.Encodings.Web (NuGet) ECOSYSTEM:introduced=4.0.0,fixed=4.5.1.

**Is there a fix for CVE-2021-26701?** Yes. System.Text.Encodings.Web (NuGet): upgrade to 4.5.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2021-26701?** Check whether you run System.Text.Encodings.Web (NuGet) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- System.Text.Encodings.Web (NuGet): upgrade to 4.5.1 or later

  ```sh
  dotnet add package System.Text.Encodings.Web --version 4.5.1
  ```


## Affected products

- System.Text.Encodings.Web (NuGet) ECOSYSTEM:introduced=4.0.0,fixed=4.5.1

## Identifiers

- CVE-2021-26701
- GHSA-ghhp-997w-qr28

## Related threats

- [Moderate severity vulnerability that affects Microsoft.AspNetCore.Mvc and Microsoft.AspNetCore.Mvc.Core](https://junglewise.ai/threats/cve-2017-0248-moderate-severity-vulnerability-that-affects-microsoft-aspnetcore)
- [ASP.NET Core fails to properly validate web requests](https://junglewise.ai/threats/cve-2017-0247-asp-net-core-fails-to-properly-validate-web-requests)
- [Moderate severity vulnerability that affects Microsoft.AspNetCore.Mvc](https://junglewise.ai/threats/cve-2017-0256-moderate-severity-vulnerability-that-affects-microsoft-aspnetcore)
- [High severity vulnerability that affects Microsoft.AspNetCore.Mvc](https://junglewise.ai/threats/cve-2017-0249-high-severity-vulnerability-that-affects-microsoft-aspnetcore-mvc)