CVE-2020-15078 Auth bypass in OpenVPN

What is CVE-2020-15078?

CVE-2020-15078 is a high-severity authentication bypass vulnerability in Canonical Ubuntu Linux, published on 26 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

OpenVPN 2.5.1 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-306, CWE-305

Which versions are affected by CVE-2020-15078?

It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Openvpn Openvpn.

How do I fix CVE-2020-15078?

Upgrade to a fixed version.

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

Is CVE-2020-15078 being exploited?

There is no known exploitation of CVE-2020-15078 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2020-15078, CLSA-2025-1759337779, CLSA-2025-1759485890, DEBIAN-CVE-2020-15078, GHSA-r2jp-995w-h282, MGASA-2021-0302 and 2 more.