# CVE-2020-3351: Cisco SD-WAN Solution Software Denial of Service Vulnerability

> Unauthenticated remote attackers can cause a denial of service by sending crafted UDP messages to Cisco SD-WAN devices.

- **Severity:** High 8.6 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Jul 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-6j89-cjff-693q

## What is CVE-2020-3351?

CVE-2020-3351 is a high-severity denial of service vulnerability in Cisco SD-WAN Solution, published on 16 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to improper validation of fields in Cisco SD-WAN peering messages that are encapsulated in UDP packets. An attacker could exploit this vulnerability by sending crafted UDP messages to the targeted system. A successful exploit could allow the attacker to cause services on the device to fail, resulting in a DoS condition that could impact the targeted device and other devices that depend on it.

Weakness: CWE-400 (Uncontrolled Resource Consumption), CWE-399

## Which versions are affected by CVE-2020-3351?

It affects 3 products.


Products: Cisco Sd-Wan Firmware, Cisco Vedge Cloud Router, Cisco Vsmart Controller.

## How do I fix CVE-2020-3351?

No fix has been published for CVE-2020-3351 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3351 being exploited?

There is no known exploitation of CVE-2020-3351 in the wild and no public exploit code.

## Other vulnerabilities in Cisco SD-WAN Solution

- [CVE-2020-3381](https://insights.sbomify.com/CVE-2020-3381/): Cisco SD-WAN vManage Software Directory Traversal Vulnerability (high 8.8)
- [CVE-2020-3115](https://insights.sbomify.com/CVE-2020-3115/): Cisco SD-WAN Solution Local Privilege Escalation Vulnerability (high 8.8)
- [CVE-2019-1626](https://insights.sbomify.com/CVE-2019-1626/): Cisco SD-WAN Solution Privilege Escalation Vulnerability (high 8.8)
- [CVE-2020-3369](https://insights.sbomify.com/CVE-2020-3369/): Cisco SD-WAN vEdge Routers Denial of Service Vulnerability (high 8.6)
- [CVE-2020-3388](https://insights.sbomify.com/CVE-2020-3388/): Cisco SD-WAN vManage Software Command Injection Vulnerability (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3351 and fix it if it is affected.

What it is: CVE-2020-3351 is a high-severity denial of service vulnerability in Cisco SD-WAN Solution, published on 16 Jul 2020. 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-2020-3351 in the wild and no public exploit code.

Affected product: Cisco SD-WAN Solution. 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-2020-3351/ (Markdown: https://insights.sbomify.com/CVE-2020-3351/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3351
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3351
- OSV: https://osv.dev/vulnerability/CVE-2020-3351

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3351/
Summaries are generated and may contain mistakes; the official description above is the record.