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

Q: Is CVE-2020-15679 being exploited?

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

Q: 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.

High 7.6 Published 22 Dec 2022 Updated 16 Apr 2025

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

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: None listed

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

Which versions are affected by CVE-2020-15679?

It affects 1 product.

Products include 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.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-15679 being exploited?

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

Sources

Also known as GHSA-6pmm-vfgm-49r7.