OpenVPN up to 2.4.12/2.5.6 External Authentication Plug-in authentication bypass

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in OpenVPN up to 2.4.12/2.5.6. Affected by this vulnerability is an unknown functionality of the component External Authentication Plug-in Handler. This manipulation causes authentication bypass. This vulnerability is handled as CVE-2022-0547. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in OpenVPN up to 2.4.12/2.5.6 (Network Encryption Software). Affected by this vulnerability is some unknown processing of the component External Authentication Plug-in Handler. The manipulation with an unknown input leads to a authentication bypass vulnerability. The CWE definition for the vulnerability is CWE-305. 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. As an impact it is known to affect confidentiality.

The weakness was released 03/19/2022. The advisory is shared at community.openvpn.net. This vulnerability is known as CVE-2022-0547 since 02/08/2022. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 232531 (Debian dla-4079 : openvpn - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (232531). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Authentication bypass
CWE: CWE-305 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 232531
Nessus Name: Debian dla-4079 : openvpn - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/08/2022 🔍
03/19/2022 +39 days 🔍
03/19/2022 +0 days 🔍
04/23/2025 +1131 days 🔍

Sourcesinfo

Advisory: community.openvpn.net
Status: Confirmed

CVE: CVE-2022-0547 (🔍)
GCVE (CVE): GCVE-0-2022-0547
GCVE (VulDB): GCVE-100-195481

Entryinfo

Created: 03/19/2022 04:47
Updated: 04/23/2025 21:51
Changes: 03/19/2022 04:47 (37), 03/23/2022 08:24 (1), 03/06/2025 10:19 (1), 03/06/2025 10:22 (18), 03/11/2025 09:37 (3), 04/23/2025 21:51 (19)
Complete: 🔍
Committer: lywand
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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