# CVE-2013-1211: Auth bypass in n/a

> Remote attackers can bypass authentication to gain VEM access on Cisco Nexus 1000V via spoofed STUN packets or crafted ESXi instances.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:P/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:** 29 May 2013
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-4cq8-34fv-5935

## What is CVE-2013-1211?

CVE-2013-1211 is a medium-severity authentication bypass vulnerability in Cisco Nx-Os, published on 29 May 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Cisco NX-OS on the Nexus 1000V does not properly handle authentication for Virtual Ethernet Module (VEM) to Virtual Supervisor Module (VSM) communication, which allows remote attackers to obtain VEM access via (1) spoofed STUN packets or (2) a crafted VMware ESXi instance, aka Bug ID CSCud14832.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2013-1211?

It affects 1 product.


Products: Cisco Nx-Os.

## How do I fix CVE-2013-1211?

No fix has been published for CVE-2013-1211 yet. Limit exposure of the affected software until one is available.

## Is CVE-2013-1211 being exploited?

There is no known exploitation of CVE-2013-1211 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Nx-Os

- [CVE-2024-20399](https://insights.sbomify.com/CVE-2024-20399/): Cisco NX-OS Command Injection (medium 6.0, exploited in the wild)
- [CVE-2021-1361](https://insights.sbomify.com/CVE-2021-1361/): Cisco NX-OS Software Unauthenticated Arbitrary File Actions Vulnerability (critical 9.8)
- [CVE-2018-0301](https://insights.sbomify.com/CVE-2018-0301/): Memory corruption in Cisco NX-OS unknown (critical 9.8)
- [CVE-2016-1453](https://insights.sbomify.com/CVE-2016-1453/): Memory corruption in n/a (critical 9.8)
- [CVE-2016-1341](https://insights.sbomify.com/CVE-2016-1341/): Hardcoded credentials in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-1211 and fix it if it is affected.

What it is: CVE-2013-1211 is a medium-severity authentication bypass vulnerability in Cisco Nx-Os, published on 29 May 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-2013-1211 in the wild and no public exploit code.

Affected product: Cisco Nx-Os. 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-2013-1211/ (Markdown: https://insights.sbomify.com/CVE-2013-1211/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-1211
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-1211
- OSV: https://osv.dev/vulnerability/CVE-2013-1211

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-1211/
Summaries are generated and may contain mistakes; the official description above is the record.