CVEs-PoC/2021/CVE-2021-21865.md

### [CVE-2021-21865](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21865)
![](https://img.shields.io/static/v1?label=Product&message=CODESYS&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=CODESYS%20GmbH%20CODESYS%20Development%20System%203.5.16%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-502%3A%20Deserialization%20of%20Untrusted%20Data&color=brightgreen)

### Description

A unsafe deserialization vulnerability exists in the PackageManagement.plugin ExtensionMethods.Clone() functionality of CODESYS GmbH CODESYS Development System 3.5.16. A specially crafted file can lead to arbitrary command execution. An attacker can provide a malicious file to trigger this vulnerability.

### POC

#### Reference
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1301

#### Github
No PoCs found on GitHub currently.