### [CVE-2021-29627](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29627)
![](https://img.shields.io/static/v1?label=Product&message=FreeBSD&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=FreeBSD%2012.2-RELEASE%20before%20p6%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Double%20free%20or%20use%20after%20free&color=brightgreen)

### Description

In FreeBSD 13.0-STABLE before n245050, 12.2-STABLE before r369525, 13.0-RC4 before p0, and 12.2-RELEASE before p6, listening socket accept filters implementing the accf_create callback incorrectly freed a process supplied argument string. Additional operations on the socket can lead to a double free or use after free.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/NaInSec/CVE-PoC-in-GitHub
- https://github.com/RoundofThree/poc
- https://github.com/SYRTI/POC_to_review
- https://github.com/WhooAmii/POC_to_review
- https://github.com/nomi-sec/PoC-in-GitHub
- https://github.com/raymontag/cve-2021-29627
- https://github.com/soosmile/POC
- https://github.com/trhacknon/Pocingit
- https://github.com/zecool/cve