# CVE-2020-15077: Auth bypass in OpenVPN Access Server

> Remote attackers can bypass authentication and access control channel data on servers with deferred authentication, potentially leading to information leaks.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/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:** 4 Jun 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-2fc6-fh8m-r4wf

## What is CVE-2020-15077?

CVE-2020-15077 is a medium-severity authentication bypass vulnerability in OpenVPN Access Server, published on 4 Jun 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OpenVPN Access Server 2.8.7 and earlier versions allows a remote attackers to bypass authentication and access control channel data on servers configured with deferred authentication, which can be used to potentially trigger further information leaks.

Weakness: CWE-287 (Improper Authentication), CWE-305 (Authentication Bypass by Primary Weakness)

## Which versions are affected by CVE-2020-15077?

It affects 1 product.


Products: Openvpn Openvpn Access Server.

## How do I fix CVE-2020-15077?

No fix has been published for CVE-2020-15077 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-15077 being exploited?

There is no known exploitation of CVE-2020-15077 in the wild and no public exploit code.

## Other vulnerabilities in OpenVPN Access Server

- [CVE-2020-8953](https://insights.sbomify.com/CVE-2020-8953/): Auth bypass in n/a (critical 9.8)
- [CVE-2021-4234](https://insights.sbomify.com/CVE-2021-4234/): Denial of service in OpenVPN Access Server (high 7.5)
- [CVE-2022-33737](https://insights.sbomify.com/CVE-2022-33737/): Information disclosure in OpenVPN Access Server (high 7.5)
- [CVE-2022-33738](https://insights.sbomify.com/CVE-2022-33738/): Weak cryptography in OpenVPN Access Server (high 7.5)
- [CVE-2020-36382](https://insights.sbomify.com/CVE-2020-36382/): Denial of service in OpenVPN Access Server (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-15077 and fix it if it is affected.

What it is: CVE-2020-15077 is a medium-severity authentication bypass vulnerability in OpenVPN Access Server, published on 4 Jun 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-15077 in the wild and no public exploit code.

Affected product: OpenVPN Access Server. 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-2020-15077/ (Markdown: https://insights.sbomify.com/CVE-2020-15077/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-15077
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-15077
- OSV: https://osv.dev/vulnerability/CVE-2020-15077

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-15077/
Summaries are generated and may contain mistakes; the official description above is the record.