### [CVE-2021-21828](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21828)
![](https://img.shields.io/static/v1?label=Product&message=AT%26T&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=AT%26T%20Labs%20Xmill%200.7%2C%20Schneider%20Electric%20EcoStruxure%20Control%20Expert%2015%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-120%3A%20Buffer%20Copy%20without%20Checking%20Size%20of%20Input%20('Classic%20Buffer%20Overflow')&color=brightgreen)

### Description

A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT&T Labs Xmill 0.7. In the default case of DecodeTreeBlock a label is created via CurPath::AddLabel in order to track the label for later reference. An attacker can provide a malicious file to trigger this vulnerability.

### POC

#### Reference
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1291

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