# CVE-2013-3436: Security feature bypass in n/a

> Remote attackers can bypass GET VPN encryption policies on Cisco IOS devices by exploiting improper GDOI traffic flow handling on UDP port 848.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:P/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jul 2013
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-6c9w-3vp8-m2hh

## What is CVE-2013-3436?

CVE-2013-3436 is a medium-severity vulnerability in Cisco Ios, published on 18 Jul 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The default configuration of the Group Encrypted Transport VPN (GET VPN) feature on Cisco IOS uses an improper mechanism for enabling Group Domain of Interpretation (GDOI) traffic flow, which allows remote attackers to bypass the encryption policy via certain uses of UDP port 848, aka Bug ID CSCui07698.

Weakness: CWE-264

## Which versions are affected by CVE-2013-3436?

It affects 1 product.


Products: Cisco Ios.

## How do I fix CVE-2013-3436?

No fix has been published for CVE-2013-3436 yet. Limit exposure of the affected software until one is available.

## Is CVE-2013-3436 being exploited?

There is no known exploitation of CVE-2013-3436 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-2013-3436 and fix it if it is affected.

What it is: CVE-2013-3436 is a medium-severity vulnerability in Cisco Ios, published on 18 Jul 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-2013-3436 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-2013-3436/ (Markdown: https://insights.sbomify.com/CVE-2013-3436/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-3436
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-3436
- OSV: https://osv.dev/vulnerability/CVE-2013-3436

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-3436/
Summaries are generated and may contain mistakes; the official description above is the record.