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Fencer Vulns
high 7.5

CVE-2020-15078 json

OpenVPN 2.5.1 and earlier versions allows a remote attackers to bypass authentication and access control channel data on servers configured…

published 2021-04-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7206

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.9%
EPSS 4.9% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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.

Patch / fix

  • openvpn openvpn 2.4.11, 2.5.2
  • openvpn Debian 14, Debian 13, Debian 12 2.5.1-2

debian advisories DEBIAN-CVE-2020-15078

  • openvpn Ubuntu 18.04 LTS 2.4.4-2ubuntu1.5
  • openvpn Ubuntu 20.04 LTS 2.4.7-1ubuntu2.20.04.2

ubuntu advisories UBUNTU-CVE-2020-15078

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvpn SLE Module for Basesystem 15 SP3, SLE Module for Basesystem 15 SP2 2.4.3-5.7.1
  • openvpn SLES for SAP 12 SP5, SLES 12 SP5 2.3.8-16.26.1
  • openvpn-openssl1 SLES 11-SECURITY 2.3.2-0.10.9.1

suse advisories SUSE-SU-2021:1577-1SUSE-SU-2021:1576-1SUSE-SU-2021:14723-1

  • openvpn openSUSE Tumbleweed 2.5.3-1.2
  • openvpn openSUSE Leap 15.2 2.4.3-lp152.6.3.1

opensuse advisories openSUSE-SU-2024:11128-1openSUSE-SU-2021:0734-1

  • openvpn Alpine 3.12, Alpine 3.11, Alpine 3.10 2.4.11-r0
  • openvpn Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 2.5.2-r0

alpine advisories ALPINE-CVE-2020-15078

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvpn Arch Linux 2.5.2-1

arch linux advisories AVG-1861

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-15078 updated cvss 7.5

openvpn: Authentication bypass with deferred authentication

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.95% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a OpenVPN

Classification

Weakness
  • CWE-305 Authentication Bypass by Primary Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.