# CVE-2013-6686: Denial of service in n/a

> Remote authenticated users can cause a denial of service in Cisco IOS SSL VPN by sending crafted DTLS packets, requiring an upgrade to mitigate.

- **Severity:** Medium 6.8 (`AV:N/AC:L/Au:S/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Nov 2013
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-7467-v6r8-xmjw

## What is CVE-2013-6686?

CVE-2013-6686 is a medium-severity denial of service vulnerability in Cisco Ios, published on 16 Nov 2013. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The SSL VPN implementation in Cisco IOS 15.3(1)T2 and earlier allows remote authenticated users to cause a denial of service (interface queue wedge) via crafted DTLS packets in an SSL session, aka Bug IDs CSCuh97409 and CSCud90568.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2013-6686?

It affects 1 product.


Products: Cisco Ios.

## How do I fix CVE-2013-6686?

No fix has been published for CVE-2013-6686 yet. Limit exposure of the affected software until one is available.

## Is CVE-2013-6686 being exploited?

There is no known exploitation of CVE-2013-6686 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios

- [CVE-2017-12240](https://insights.sbomify.com/CVE-2017-12240/): Cisco IOS and IOS XE Software DHCP Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-3881](https://insights.sbomify.com/CVE-2017-3881/): Cisco IOS and IOS XE Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2018-0167](https://insights.sbomify.com/CVE-2018-0167/): Cisco IOS, XR, and XE Software Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2017-6736](https://insights.sbomify.com/CVE-2017-6736/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-6737](https://insights.sbomify.com/CVE-2017-6737/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-6686 and fix it if it is affected.

What it is: CVE-2013-6686 is a medium-severity denial of service vulnerability in Cisco Ios, published on 16 Nov 2013. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2013-6686 in the wild and no public exploit code.

Affected product: Cisco Ios. 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-2013-6686/ (Markdown: https://insights.sbomify.com/CVE-2013-6686/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-6686
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-6686
- OSV: https://osv.dev/vulnerability/CVE-2013-6686

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-6686/
Summaries are generated and may contain mistakes; the official description above is the record.