# CVE-2021-43853: AjaxNetProfessional deserializes arbitrary JavaScript objects

Source: https://junglewise.ai/threats/cve-2021-43853-ajaxnetprofessional-deserializes-arbitrary-javascript-objects  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-01-06  
License: CC BY 4.0 with a link back

CVE-2021-43853 · Severity: low · CVSS 3.1 · Published 2022-01-06

AjaxNetProfessional deserializes arbitrary JavaScript objects

Technologies: [AjaxNetProfessional (NuGet)](https://junglewise.ai/threats/technologies/ajaxnetprofessional). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2021-43853 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-43853 being exploited in the wild.

**How severe is CVE-2021-43853?** Low severity, with a CVSS score of 3.1, published 6 January 2022.

**Which products and versions are affected?** AjaxNetProfessional (NuGet) ECOSYSTEM:introduced=0,fixed=21.12.22.1.

**Is there a fix for CVE-2021-43853?** Yes. AjaxNetProfessional (NuGet): upgrade to 21.12.22.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2021-43853?** Check whether you run AjaxNetProfessional (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

- AjaxNetProfessional (NuGet): upgrade to 21.12.22.1 or later

  ```sh
  dotnet add package AjaxNetProfessional --version 21.12.22.1
  ```


## Affected products

- AjaxNetProfessional (NuGet) ECOSYSTEM:introduced=0,fixed=21.12.22.1

## Identifiers

- CVE-2021-43853
- GHSA-5q7q-qqw2-hjq7

## Related threats

- [Ajax Pro Cross-site Scripting](https://junglewise.ai/threats/cve-2023-49289-ajax-pro-cross-site-scripting)
- [Duplicate Advisory: Remote Code Execution in AjaxNetProfessional](https://junglewise.ai/threats/duplicate-advisory-remote-code-execution-in-ajaxnetprofessional-d122e02f)
- [Remote Code Execution in AjaxNetProfessional](https://junglewise.ai/threats/cve-2021-23758-ajax-net-professional-unsafe-deserialization-of-untrusted-data)