# CVE-2020-15679: Auth bypass in Mozilla VPN Android 1.1.0

> Attackers can hijack VPN sessions via crafted URLs if sharing an IP, allowing unauthorized access and session control.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 22 Dec 2022
- **Updated:** 16 Apr 2025
- **Also known as:** GHSA-6pmm-vfgm-49r7

## What is CVE-2020-15679?

CVE-2020-15679 is a high-severity authentication bypass vulnerability in Mozilla VPN Android 1.1.0, published on 22 Dec 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An OAuth session fixation vulnerability existed in the VPN login flow, where an attacker could craft a custom login URL, convince a VPN user to login via that URL, and obtain authenticated access as that user. This issue is limited to cases where attacker and victim are sharing the same source IP and could allow the ability to view session states and disconnect VPN sessions. This vulnerability affects Mozilla VPN iOS 1.0.7 < (929), Mozilla VPN Windows < 1.2.2, and Mozilla VPN Android 1.1.0 < (1360).

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2020-15679?

It affects 1 product.


Products: Mozilla Vpn.

## How do I fix CVE-2020-15679?

No fix has been published for CVE-2020-15679 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-15679 being exploited?

There is no known exploitation of CVE-2020-15679 in the wild and no public exploit code.

## Other vulnerabilities in Mozilla VPN Android 1.1.0

- [CVE-2025-5687](https://insights.sbomify.com/CVE-2025-5687/): Local privilege escalation vulnerability in Mozilla VPN clients for macOS v2.27.0 and below. (high 7.8)
- [CVE-2022-0517](https://insights.sbomify.com/CVE-2022-0517/): Code injection in Mozilla VPN (high 7.8)
- [CVE-2023-4104](https://insights.sbomify.com/CVE-2023-4104/): Missing authorization in Mozilla VPN 2.16.1 (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-15679 and fix it if it is affected.

What it is: CVE-2020-15679 is a high-severity authentication bypass vulnerability in Mozilla VPN Android 1.1.0, published on 22 Dec 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-15679 in the wild and no public exploit code.

Affected product: Mozilla VPN Android 1.1.0. 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-2020-15679/ (Markdown: https://insights.sbomify.com/CVE-2020-15679/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-15679
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-15679
- OSV: https://osv.dev/vulnerability/CVE-2020-15679

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-15679/
Summaries are generated and may contain mistakes; the official description above is the record.