CVE-2005-2531

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.

5.0

CVSS

Severity: Medium

CVSS 2.0 •

EPSS 1.41% Top 25%

Vendor Advisory mandriva.com Vendor Advisory novell.com Vendor Advisory debian.org

Affected: n/a n/a

References

Link	Tags
http://www.securityfocus.com/bid/14605	vdb entry
http://secunia.com/advisories/17103	third party advisory
http://openvpn.net/changelog.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:145	patch vendor advisory
http://www.novell.com/linux/security/advisories/2005_20_sr.html	vendor advisory
http://www.debian.org/security/2005/dsa-851	vendor advisory
http://secunia.com/advisories/16463	third party advisory

Frequently Asked Questions

What is the severity of CVE-2005-2531?: CVE-2005-2531 has been scored as a medium severity vulnerability.
How to fix CVE-2005-2531?: To fix CVE-2005-2531, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2005-2531 being actively exploited in the wild?: It is possible that CVE-2005-2531 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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