CVEs-PoC/2021/CVE-2021-20986.md

### [CVE-2021-20986](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20986)
![](https://img.shields.io/static/v1?label=Product&message=OHV&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=OIT&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=PCV%2FPXV%2FPGV&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=PHA&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=PROFINET%20IO%20Device&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=PXV%2FPGV%20B28%20Profisafe&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=WCS&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=OHV-F230-B17%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=OIT500-F113-B17-CB%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=PCV100-F200-B17-V1D-6011%2C%20PCV100-F200-B17-V1D-6011-8203%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=PCV80-F200-B17-V1D%2C%20PCV100-F200-B17-V1D%2C%20PCV50-F200-B17-V1D%2C%20PCV100-F200-B17-V1D-6011-6997%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=PGV100-F200A-B17-V1D%2C%20PGV150I-F200A-B17-V1D%2C%20PGV100-F200-B17-V1D-7477%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=PGV100AQ-F200A-B28-V1D%2C%20PGV100AQ-F200-B28-V1D%2C%20PXV100AQ-F200-B28-V1D%2C%20PXV100AQ-F200-B28-V1D-6011%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=PHA300-F200-B17-V1D%2C%20PHA400-F200-B17-V1D%2C%20PHA300-F200A-B17-V1D%2C%20PHA300-F200-B17-T-V1D%2C%20PHA200-F200A-B17-V1D%2C%20PHA200-F200-B17-V1D%2C%20PHA400-F200A-B17-V1D%2C%20PHA300-F200A-B17-T-V1D%2C%20PHA600-F200A-B17-V1D%2C%20PHA500-F200-B17-V1D%2C%20PHA500-F200A-B17-V1D%2C%20PHA600-F200-B17-V1D%2C%20PHA150-F200A-B17-V1D%2C%20PHA200-F200A-B17-T-V1D%2C%20PHA150-F200-B17-V1D%2C%20PHA800-F200-B17-V1D%2C%20PHA400-F200A-B17-T-V1D%2C%20PHA500-F200A-B17-T-V1D%2C%20PHA700-F200-B17-V1D%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=PXV100-F200-B17-V1D%2C%20PXV100-F200-B17-V1D-3636%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=PXV100A-F200-B28-V1D%2C%20PXV100A-F200-B28-V1D-6011%2C%20PGV100A-F200-B28-V1D%2C%20PGV100A-F200A-B28-V1D%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=V3%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=WCS3B-LS610%2C%20WCS3B-LS610H%2C%20WCS3B-LS610D%2C%20WCS3B-LS610DH%2C%20WCS3B-LS610H-OM%2C%20WCS3B-LS610DH-OM%2C%20WCS3B-LS610D-OM%2C%20CS3B-LS610-OM%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-787%20Out-of-bounds%20Write&color=brightgreen)

### Description

A Denial of Service vulnerability was found in Hilscher PROFINET IO Device V3 in versions prior to V3.14.0.7. This may lead to unexpected loss of cyclic communication or interruption of acyclic communication.

### POC

#### Reference
- https://cert.vde.com/en-us/advisories/vde-2021-006

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