Vulnerability Report

CVE-2005-2534

Title: Race condition in OpenVPN leads to server crash

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2005-2534.

CWE Category NVD-CWE-noinfo

Published Date Aug 24, 2005

Modified Date Jun 16, 2026

Exploit Status Not Found

Score 2.6 CVSS v2.0

Exploit Probability (EPSS)

0.97%

Vulnerability Summary

CVE-2005-2534: Race condition in OpenVPN before 2.0.1, when --duplicate-cn is not enabled, allows remote attackers to cause a denial of service (server crash) via simultaneous TCP connections from multiple clients that use the same client certificate.

Impacted Vendors

openvpn 1

aviatrix 1

Reference Links

http://openvpn.net/changelog.html 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.securityfocus.com/bid/14610 http://openvpn.net/changelog.html 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.securityfocus.com/bid/14610

CVSS v2.0

Source Entity [email protected]

Severity LOW

2.6

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:H/Au:N/C:N/I:N/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2005-2534 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

April 03, 2025 MODIFIED

Vulnerability data or affected products updated.

August 24, 2005 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A

Complexity N/A

Privileges N/A

Interaction NONE

CVSS Vector String


                                    AV:N/AC:H/Au:N/C:N/I:N/A:P

Affected Stack

No specific products linked.