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.
Advisories
Source ID Title
EUVD EUVD EUVD-2005-2532 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.
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

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Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-08-07T22:30:01.294Z

Reserved: 2005-08-10T00:00:00

Link: CVE-2005-2531

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2005-08-24T04:00:00.000

Modified: 2025-04-03T01:03:51.193

Link: CVE-2005-2531

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses