CVE-2005-3409: Openvpn

Medium severity, CVSS 5.0. EPSS: 2.5% chance of exploitation in the next 30 days.

OpenVPN 2.x before 2.0.4, when running in TCP mode, allows remote attackers to cause a denial of service (segmentation fault) by forcing the accept function call to return an error status, which leads to a null dereference in an exception handler.

Affected products

• Openvpn Openvpn: version 2.0 only; version 2.0.1_rc1 only; version 2.0.1_rc2 only; version 2.0.1_rc3 only; version 2.0.1_rc4 only; version 2.0.1_rc5 only; …
• Openvpn Openvpn Access Server: version 2.0.1 only; version 2.0.2 only

Published 2005-11-02. Last modified 2026-06-16.