# CVE-2020-3405: Cisco SD-WAN vManage Software XML External Entity Vulnerability

> Authenticated attackers can read and write files via XXE in Cisco SD-WAN vManage by tricking users into importing malicious XML.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Jul 2020
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-v7ff-8293-rf9q

## What is CVE-2020-3405?

CVE-2020-3405 is a medium-severity vulnerability in Cisco SD-WAN vManage, published on 16 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in the web UI of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to gain read and write access to information that is stored on an affected system. The vulnerability is due to improper handling of XML External Entity (XXE) entries when parsing certain XML files. An attacker could exploit this vulnerability by persuading a user to import a crafted XML file with malicious entries. A successful exploit could allow the attacker to read and write files within the affected application.

Weakness: CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2020-3405?

It affects 1 product.


Products: Cisco Sd-Wan Firmware.

## How do I fix CVE-2020-3405?

No fix has been published for CVE-2020-3405 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3405 being exploited?

There is no known exploitation of CVE-2020-3405 in the wild and no public exploit code.

## Other vulnerabilities in Cisco SD-WAN vManage

- [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-2020-3351](https://insights.sbomify.com/CVE-2020-3351/): Cisco SD-WAN Solution Software Denial of Service Vulnerability (high 8.6)
- [CVE-2020-3369](https://insights.sbomify.com/CVE-2020-3369/): Cisco SD-WAN vEdge Routers Denial of Service Vulnerability (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3405 and fix it if it is affected.

What it is: CVE-2020-3405 is a medium-severity vulnerability in Cisco SD-WAN vManage, published on 16 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-3405 in the wild and no public exploit code.

Affected product: Cisco SD-WAN vManage. 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-2020-3405/ (Markdown: https://insights.sbomify.com/CVE-2020-3405/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3405
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3405
- OSV: https://osv.dev/vulnerability/CVE-2020-3405

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-3405/
Summaries are generated and may contain mistakes; the official description above is the record.