Vulnerabilities
Misconfiguration
Compliance
Cryptography
CVE Vulnerabilities

CVE-2020-15078

Authentication Bypass by Primary Weakness

Published: Apr 26, 2021 | Modified: Jun 17, 2026
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-15078
CWEhttps://cwe.mitre.org/data/definitions/305.html

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

The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

Affected Software

NameVendorStart VersionEnd Version
OpenvpnOpenvpn*2.4.11 (excluding)
OpenvpnOpenvpn2.5.0 (including)2.5.2 (excluding)
OpenvpnUbuntubionic*
OpenvpnUbuntudevel*
OpenvpnUbuntuesm-infra/bionic*
OpenvpnUbuntuesm-infra/focal*
OpenvpnUbuntufocal*
OpenvpnUbuntugroovy*
OpenvpnUbuntuhirsute*
OpenvpnUbuntuimpish*
OpenvpnUbuntujammy*
OpenvpnUbuntutrusty*
OpenvpnUbuntuupstream*

References

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