CVEs-PoC/2021/CVE-2021-31889.md

### [CVE-2021-31889](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31889)
![](https://img.shields.io/static/v1?label=Product&message=Capital%20Embedded%20AR%20Classic%20431-422&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Capital%20Embedded%20AR%20Classic%20R20-11&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=PLUSCONTROL%201st%20Gen&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=SIMOTICS%20CONNECT%20400&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=All%20versions%20%3C%20V0.5.0.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=All%20versions%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-191%3A%20Integer%20Underflow%20(Wrap%20or%20Wraparound)&color=brightgreen)

### Description

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), PLUSCONTROL 1st Gen (All versions), SIMOTICS CONNECT 400 (All versions < V0.5.0.0). Malformed TCP packets with a corrupted SACK option leads to Information Leaks and Denial-of-Service conditions. (FSMD-2021-0015)

### POC

#### Reference
- https://cert-portal.siemens.com/productcert/pdf/ssa-114589.pdf

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