CVE-2005-2531

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    CVE-2005-2531

    Published: 24 Aug 2005Last Modified: 10 Apr 2026

    Summary:

    Details: 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.

    References: http://secunia.com/advisories/16463, http://secunia.com/advisories/17103, http://www.debian.org/security/2005/dsa-851, http://www.mandriva.com/security/advisories?name=MDKSA-2005:145, http://www.novell.com/linux/security/advisories/2005_20_sr.html, http://www.mandriva.com/security/advisories?name=MDKSA-2005:145, http://openvpn.net/changelog.html, http://www.securityfocus.com/bid/14605

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High