# CVE-2007-4103: Denial of service in n/a

> Remote attackers can cause resource exhaustion and denial of service in Asterisk by flooding unauthenticated IAX2 calls that fail to complete handshakes.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 31 Jul 2007
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2007-4103, GHSA-9jqm-gvwx-9wxq

## What is CVE-2007-4103?

CVE-2007-4103 is a high-severity denial of service vulnerability in Digium Asterisk, published on 31 Jul 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-772 (Missing Release of Resource after Effective Lifetime)

## Which versions are affected by CVE-2007-4103?

It affects 2 products.


Products: Digium Asterisk, Digium Asterisk Appliance Developer Kit.

## How do I fix CVE-2007-4103?

Upgrade to a fixed version.

## Is CVE-2007-4103 being exploited?

There is no known exploitation of CVE-2007-4103 in the wild and no public exploit code.

## Other vulnerabilities in Digium Asterisk

- [CVE-2017-14100](https://insights.sbomify.com/CVE-2017-14100/): Command injection in n/a (critical 9.8)
- [CVE-2014-8418](https://insights.sbomify.com/CVE-2014-8418/): Privilege escalation in n/a (critical 9.0)
- [CVE-2011-1599](https://insights.sbomify.com/CVE-2011-1599/): Missing authorization in n/a (critical 9.0)
- [CVE-2017-16671](https://insights.sbomify.com/CVE-2017-16671/): Memory corruption in n/a (high 8.8)
- [CVE-2017-7617](https://insights.sbomify.com/CVE-2017-7617/): Memory corruption in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-4103 and fix it if it is affected.

What it is: CVE-2007-4103 is a high-severity denial of service vulnerability in Digium Asterisk, published on 31 Jul 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2007-4103 in the wild and no public exploit code.

Affected product: Digium Asterisk. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2007-4103/ (Markdown: https://insights.sbomify.com/CVE-2007-4103/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-4103
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-4103
- OSV: https://osv.dev/vulnerability/CVE-2007-4103

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-4103/
Summaries are generated and may contain mistakes; the official description above is the record.