# CVE-2024-20496: Cisco SD-WAN vEdge Routers Denial of Service Vulnerability

> An unauthenticated adjacent attacker can cause a denial of service by sending crafted UDP packets to Cisco SD-WAN vEdge routers.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Sep 2024
- **Updated:** 25 Sep 2024
- **Also known as:** GHSA-3phf-8x93-jmv2

## What is CVE-2024-20496?

CVE-2024-20496 is a medium-severity denial of service vulnerability in Cisco SD-WAN vEdge Cloud, published on 25 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the UDP packet validation code of Cisco SD-WAN vEdge Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected system.

This vulnerability is due to incorrect handling of a specific type of malformed UDP packet. An attacker in a machine-in-the-middle position could exploit this vulnerability by sending crafted UDP packets to an affected device. A successful exploit could allow the attacker to cause the device to reboot, resulting in a DoS condition on the affected system.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2024-20496?


## How do I fix CVE-2024-20496?

No fix has been published for CVE-2024-20496 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-20496 being exploited?

There is no known exploitation of CVE-2024-20496 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-20496 and fix it if it is affected.

What it is: CVE-2024-20496 is a medium-severity denial of service vulnerability in Cisco SD-WAN vEdge Cloud, published on 25 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-20496 in the wild and no public exploit code.

Affected product: Cisco SD-WAN vEdge Cloud. 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-2024-20496/ (Markdown: https://insights.sbomify.com/CVE-2024-20496/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-20496
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-20496
- OSV: https://osv.dev/vulnerability/CVE-2024-20496

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-20496/
Summaries are generated and may contain mistakes; the official description above is the record.