CVE-2005-2534

Race condition in OpenVPN before 2.0.1, when --duplicate-cn is not enabled, allows remote...

2.6 LowFix available

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.

Exploit likelihood

0.97%Down 0.4 points since Feb 4, 2022

What each source reports

NVD Score used 2.6

Record: CVE-2005-2534
CVSS 2.0: 2.6 LowAV:N/AC:H/Au:N/C:N/I:N/A:P
Updated: 2026-11-02

CVE List No score

Record: CVE-2005-2534
Updated: 2026-11-02

EUVDEUVD-2005-2535 No score

Record: EUVD-2005-2535
Updated: 2026-11-03

GitHub AdvisoriesGHSA-gj66-3prg-44gq No score

Race condition in OpenVPN before 2.0.1, when --duplicate-cn is not enabled, allows remote...

Record: GHSA-gj66-3prg-44gq
Updated: 2026-11-02

OSV No score

Record: CVE-2005-2534
Updated: 2026-11-02

OSVDEBIAN-CVE-2005-2534 No score

Record: DEBIAN-CVE-2005-2534
Updated: 2026-11-02

Affected products

openvpn

Affected packages

Affected packages
Package	Affected	Fixed
`openvpn` Debian:12	before 2.0.2-1	2.0.2-1
`openvpn` Debian:13	before 2.0.2-1	2.0.2-1
`openvpn` Debian:14	before 2.0.2-1	2.0.2-1
`openvpn` Debian:3.1	before 2.0-1sarge1, plus listed versions 2.0-1	2.0-1sarge1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2005-2534 is a low vulnerability (CVSS 2.6) in Openvpn, published August 24, 2005. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.97%, the 61st percentile. Fixed in openvpn 2.0.2-1.