# CVE-2013-2686: Denial of service in n/a

> Remote attackers can crash the Asterisk HTTP server via crafted POST requests due to improper Content-Length restriction, causing 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:** 29 Mar 2013
- **Updated:** 16 Sep 2024
- **Also known as:** DEBIAN-CVE-2013-2686, GHSA-32mc-px3q-67r4

## What is CVE-2013-2686?

CVE-2013-2686 is a medium-severity denial of service vulnerability in n/a, published on 29 Mar 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

main/http.c in the HTTP server in Asterisk Open Source 1.8.x before 1.8.20.2, 10.x before 10.12.2, and 11.x before 11.2.2; Certified Asterisk 1.8.15 before 1.8.15-cert2; and Asterisk Digiumphones 10.x-digiumphones before 10.12.2-digiumphones does not properly restrict Content-Length values, which allows remote attackers to conduct stack-consumption attacks and cause a denial of service (daemon crash) via a crafted HTTP POST request.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2012-5976.

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

## Which versions are affected by CVE-2013-2686?

It affects 3 products.


Products: Asterisk Certified Asterisk, Asterisk Digiumphones, Asterisk Open Source.

## How do I fix CVE-2013-2686?

Upgrade to a fixed version.

## Is CVE-2013-2686 being exploited?

There is no known exploitation of CVE-2013-2686 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-21723](https://insights.sbomify.com/CVE-2022-21723/): Out-of-bounds read in multipart parsing in PJSIP (critical 9.1)
- [CVE-2022-23608](https://insights.sbomify.com/CVE-2022-23608/): Use after free in PJSIP (high 8.1)
- [CVE-2017-9358](https://insights.sbomify.com/CVE-2017-9358/): Denial of service in n/a (high 7.5)
- [CVE-2021-37706](https://insights.sbomify.com/CVE-2021-37706/): Potential integer underflow upon receiving STUN message in PJSIP (high 7.3)
- [CVE-2021-46837](https://insights.sbomify.com/CVE-2021-46837/): Null dereference in n/a (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-2686 and fix it if it is affected.

What it is: CVE-2013-2686 is a medium-severity denial of service vulnerability in n/a, published on 29 Mar 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-2013-2686 in the wild and no public exploit code.

Affected product: n/a. 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-2013-2686/ (Markdown: https://insights.sbomify.com/CVE-2013-2686/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-2686
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-2686
- OSV: https://osv.dev/vulnerability/CVE-2013-2686

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From sbomify Insights: https://insights.sbomify.com/CVE-2013-2686/
Summaries are generated and may contain mistakes; the official description above is the record.