cve/2019/CVE-2019-18976.md

### [CVE-2019-18976](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18976)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur. This is different from CVE-2019-18940.

### POC

#### Reference
- https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html
- https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1

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