CVE-2013-20001 Auth bypass in n/a

High 7.5 Published 12 Feb 2021 Updated 3 Nov 2025

Attackers can bypass IPv6 access restrictions on OpenZFS NFS shares, gaining unauthorized read access to exported data.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2013-20001?

CVE-2013-20001 is a high-severity authentication bypass vulnerability in n/a, published on 12 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in OpenZFS through 2.0.3. When an NFS share is exported to IPv6 addresses via the sharenfs feature, there is a silent failure to parse the IPv6 address data, and access is allowed to everyone. IPv6 restrictions from the configuration are not applied.

Which versions are affected by CVE-2013-20001?

It affects 1 product.

Products include Openzfs Openzfs.

How do I fix CVE-2013-20001?

Apply the vendor's patch.

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

Is CVE-2013-20001 being exploited?

There is no known exploitation of CVE-2013-20001 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2013-20001, GHSA-95qf-v6r5-2v3v, UBUNTU-CVE-2013-20001, USN-6511-1.