Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2005-2531

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
24/08/2005
Last modified:
03/04/2025

Description

OpenVPN before 2.0.1, when running with "verb 0" and without TLS authentication, does not properly flush the OpenSSL error queue when a client fails certificate authentication to the server and causes the error to be processed by the wrong client, which allows remote attackers to cause a denial of service (client disconnection) via a large number of failed authentication attempts.

Impact

Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:openvpn:openvpn:2.0:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0.1_rc1:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0.1_rc2:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0.1_rc3:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0.1_rc4:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0.1_rc5:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0.1_rc6:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0.1_rc7:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0_beta1:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0_beta2:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0_beta3:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0_beta4:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0_beta5:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0_beta6:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn:2.0_beta7:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools