# CVE-2013-5641: Null dereference in n/a

> Remote attackers can crash the Asterisk PBX daemon by sending a specific SIP ACK packet to a terminated channel, causing a denial of service.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Sep 2013
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2013-5641, GHSA-vx3m-32pc-pfvq

## What is CVE-2013-5641?

CVE-2013-5641 is a medium-severity vulnerability in Digium Asterisk, published on 9 Sep 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The SIP channel driver (channels/chan_sip.c) in Asterisk Open Source 1.8.17.x through 1.8.22.x, 1.8.23.x before 1.8.23.1, and 11.x before 11.5.1 and Certified Asterisk 1.8.15 before 1.8.15-cert3 and 11.2 before 11.2-cert2 allows remote attackers to cause a denial of service (NULL pointer dereference, segmentation fault, and daemon crash) via an ACK with SDP to a previously terminated channel.  NOTE: some of these details are obtained from third party information.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2013-5641?

It affects 2 products.


Products: Digium Asterisk, Digium Certified Asterisk.

## How do I fix CVE-2013-5641?

Upgrade to a fixed version.

## Is CVE-2013-5641 being exploited?

There is no known exploitation of CVE-2013-5641 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-2013-5641 and fix it if it is affected.

What it is: CVE-2013-5641 is a medium-severity vulnerability in Digium Asterisk, published on 9 Sep 2013. 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-2013-5641 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-2013-5641/ (Markdown: https://insights.sbomify.com/CVE-2013-5641/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-5641
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-5641
- OSV: https://osv.dev/vulnerability/CVE-2013-5641

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-5641/
Summaries are generated and may contain mistakes; the official description above is the record.