# CVE-2013-4686: Denial of service in n/a

> Remote attackers can crash Juniper Junos devices via crafted ARP requests when specific VLAN settings are enabled.

- **Severity:** High 7.1 (`AV:N/AC:M/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Jul 2013
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-58r4-7mj9-4vhp

## What is CVE-2013-4686?

CVE-2013-4686 is a high-severity denial of service vulnerability in Juniper Junos, published on 11 Jul 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The kernel in Juniper Junos 10.4 before 10.4R14, 11.4 before 11.4R8, 11.4X27 before 11.4X27.43, 12.1 before 12.1R6, 12.1X44 before 12.1X44-D20, 12.2 before 12.2R4, and 12.3 before 12.3R2, in certain VLAN configurations with unrestricted arp-resp and proxy-arp settings, allows remote attackers to cause a denial of service (device crash) via a crafted ARP request, aka PR 842091.

## Which versions are affected by CVE-2013-4686?

It affects 1 product.


Products: Juniper Junos.

## How do I fix CVE-2013-4686?

No fix has been published for CVE-2013-4686 yet. Limit exposure of the affected software until one is available.

## Is CVE-2013-4686 being exploited?

There is no known exploitation of CVE-2013-4686 in the wild and no public exploit code.

## Other vulnerabilities in Juniper Junos

- [CVE-2023-36845](https://insights.sbomify.com/CVE-2023-36845/): Juniper Junos OS EX Series and SRX Series PHP External Variable Modification (critical 9.8, exploited in the wild)
- [CVE-2020-1631](https://insights.sbomify.com/CVE-2020-1631/): Juniper Junos OS Path Traversal (high 8.8, exploited in the wild)
- [CVE-2025-21590](https://insights.sbomify.com/CVE-2025-21590/): Juniper Junos OS Improper Isolation or Compartmentalization (medium 6.7, exploited in the wild)
- [CVE-2023-36851](https://insights.sbomify.com/CVE-2023-36851/): Juniper Junos OS SRX Series Missing Authentication for Critical Function (medium 5.3, exploited in the wild)
- [CVE-2023-36844](https://insights.sbomify.com/CVE-2023-36844/): Juniper Junos OS EX Series PHP External Variable Modification (medium 5.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2013-4686 and fix it if it is affected.

What it is: CVE-2013-4686 is a high-severity denial of service vulnerability in Juniper Junos, published on 11 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-2013-4686 in the wild and no public exploit code.

Affected product: Juniper Junos. 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-2013-4686/ (Markdown: https://insights.sbomify.com/CVE-2013-4686/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-4686
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-4686
- OSV: https://osv.dev/vulnerability/CVE-2013-4686

---
From sbomify Insights: https://insights.sbomify.com/CVE-2013-4686/
Summaries are generated and may contain mistakes; the official description above is the record.