Skip to content
Fencer Vulns
critical 9.8

CVE-2022-0547 json

OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than one of them makes…

published 2022-03-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-15669

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.5%
EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than one of them makes use of deferred authentication replies, which allows an external user to be granted access with only partially correct credentials.

Patch / fix

  • openvpn openvpn 2.4.12, 2.5.6
  • openvpn Debian 14, Debian 13, Debian 12 2.5.6-1

debian advisories DEBIAN-CVE-2022-0547

  • openvpn Ubuntu 18.04 LTS 2.4.4-2ubuntu1.7
  • openvpn Ubuntu 20.04 LTS 2.4.7-1ubuntu2.20.04.4
  • openvpn Ubuntu 22.04 LTS 2.5.5-1ubuntu3
  • openvpn Ubuntu Pro 14.04 LTS 2.3.2-7ubuntu3.2+esm1
  • openvpn Ubuntu Pro 16.04 LTS 2.3.10-1ubuntu2.2+esm1

ubuntu advisories UBUNTU-CVE-2022-0547

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 SP4, openSUSE Leap 15.4 2.5.6-150400.3.3.1
  • openvpn-openssl1 SLES 11-SECURITY 2.3.2-0.10.12.1
  • openvpn SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +18 more 2.4.3-150000.5.10.1
  • openvpn SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +10 more 2.3.8-16.29.1

suse advisories SUSE-SU-2022:1934-1SUSE-SU-2022:14937-1SUSE-SU-2022:1029-1SUSE-SU-2022:1024-1

  • openvpn openSUSE Tumbleweed 2.5.6-1.1
  • openvpn openSUSE Leap 15.3 2.4.3-150000.5.10.1

opensuse advisories openSUSE-SU-2024:11968-1openSUSE-SU-2022:1029-1

  • openvpn Alpine 3.12 2.4.12-r0
  • openvpn Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 2.5.6-r0

alpine advisories ALPINE-CVE-2022-0547

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

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-2022-0547 updated cvss 4.8

openvpn: Authentication bypass

  • 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

cisa ICSA-23-166-12 updated cvss 9.8

Siemens SINAMICS Medium Voltage Products

  • Siemens SINAMICS PERFECT HARMONY GH180 6SR5
    affected: vendor fix, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-23-075-01 updated cvss 9.8

Siemens SCALANCE, RUGGEDCOM Third-Party

  • Siemens RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2) <V7.2 Siemens RUGGEDCOM RM1224 LTE(4G) NAM (6GK6108-4AM00-2DA2) <V7.2 Siemens SCALANCE M804PB (6GK5804-0AP00-2AA2) <V7.2 Siemens SCALANCE M812-1 ADSL-Router (Annex A) (6GK5812-1AA00-2AA2) <V7.2 Siemens SCALANCE M812-1 ADSL-Router (Annex B) (6GK5812-1BA00-2AA2) <V7.2 Siemens SCALANCE M816-1 ADSL-Router (Annex A) (6GK5816-1AA00-2AA2) <V7.2
    +14 more products
    Siemens SCALANCE M816-1 ADSL-Router (Annex B) (6GK5816-1BA00-2AA2) <V7.2 Siemens SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2) <V7.2 Siemens SCALANCE M874-2 (6GK5874-2AA00-2AA2) <V7.2 Siemens SCALANCE M874-3 (6GK5874-3AA00-2AA2) <V7.2 Siemens SCALANCE M876-3 (EVDO) (6GK5876-3AA02-2BA2) <V7.2 Siemens SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2) <V7.2 Siemens SCALANCE M876-4 (6GK5876-4AA10-2BA2) <V7.2 Siemens SCALANCE M876-4 (EU) (6GK5876-4AA00-2BA2) <V7.2 Siemens SCALANCE M876-4 (NAM) (6GK5876-4AA00-2DA2) <V7.2 Siemens SCALANCE MUM853-1 (EU) (6GK5853-2EA00-2DA1) <V7.2 Siemens SCALANCE MUM856-1 (EU) (6GK5856-2EA00-3DA1) <V7.2 Siemens SCALANCE MUM856-1 (RoW) (6GK5856-2EA00-3AA1) <V7.2 Siemens SCALANCE S615 (6GK5615-0AA00-2AA2) <V7.2 Siemens SCALANCE S615 EEC (6GK5615-0AA01-2AA2) <V7.2
    affected: fixed in V7.2 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
18 mo ago

Exploit prediction

3.48% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a OpenVPN

Classification

Weakness
  • CWE-305 Authentication Bypass by Primary Weakness
  • CWE-287 Improper Authentication

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.