# CVE-2020-3483: Duo Network Gateway (DNG) Information Disclosure Vulnerability

> Attackers with host access can read logged SSL private keys, enabling decryption of TLS traffic to protected applications.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Oct 2020
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-6348-6g85-hp24

## What is CVE-2020-3483?

CVE-2020-3483 is a high-severity vulnerability in Cisco Duo Network Gateway (DNG), published on 14 Oct 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Duo has identified and fixed an issue with the Duo Network Gateway (DNG) product in which some customer-provided SSL certificates and private keys were not excluded from logging. This issue resulted in certificate and private key information being written out in plain-text to local files on the DNG host. Any private keys logged in this way could be viewed by those with access to the DNG host operating system without any need for reversing encrypted values or similar techniques. An attacker that gained access to the DNG logs and with the ability to intercept and manipulate network traffic between a user and the DNG, could decrypt and manipulate SSL/TLS connections to the DNG and to the protected applications behind it. Duo Network Gateway (DNG) versions 1.3.3 through 1.5.7 are affected.

Weakness: CWE-522 (Insufficiently Protected Credentials), CWE-256 (Plaintext Storage of a Password)

## Which versions are affected by CVE-2020-3483?

It affects 1 product.


Products: Cisco Duo Network Gateway.

## How do I fix CVE-2020-3483?

No fix has been published for CVE-2020-3483 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3483 being exploited?

There is no known exploitation of CVE-2020-3483 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Duo Network Gateway (DNG)

- [CVE-2018-7340](https://insights.sbomify.com/CVE-2018-7340/): Multiple SAML libraries may allow authentication bypass via incorrect XML canonicalization and DOM traversal (high 7.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3483 and fix it if it is affected.

What it is: CVE-2020-3483 is a high-severity vulnerability in Cisco Duo Network Gateway (DNG), published on 14 Oct 2020. 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-2020-3483 in the wild and no public exploit code.

Affected product: Cisco Duo Network Gateway (DNG). 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-2020-3483/ (Markdown: https://insights.sbomify.com/CVE-2020-3483/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3483
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3483
- OSV: https://osv.dev/vulnerability/CVE-2020-3483

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-3483/
Summaries are generated and may contain mistakes; the official description above is the record.