CVE-2020-36382 Denial of service in OpenVPN Access Server

High 7.5 Published 4 Jun 2021 Updated 4 Aug 2024

Remote attackers can cause a denial of service in OpenVPN Access Server by sending malformed authentication tokens during the login phase.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-36382?

CVE-2020-36382 is a high-severity denial of service vulnerability in OpenVPN Access Server, published on 4 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

OpenVPN Access Server 2.7.3 to 2.8.7 allows remote attackers to trigger an assert during the user authentication phase via incorrect authentication token data in an early phase of the user authentication resulting in a denial of service.

Weakness: CWE-617, CWE-754

Which versions are affected by CVE-2020-36382?

It affects 1 product.

Products include Openvpn Openvpn Access Server.

How do I fix CVE-2020-36382?

No fix has been published for CVE-2020-36382 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-36382 being exploited?

There is no known exploitation of CVE-2020-36382 in the wild and no public exploit code.

Sources

Also known as GHSA-j34c-6692-hx97.