CVE-2005-2534

2.6 LOW 1.0% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 1.0% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2005-08-24 04:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 22:15 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 1.0% in the next 30 days (EPSS).
Severity: 2.6 LOW (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2005-08-24 04:00 UTC
Last modified: 2026-06-16 22:15 UTC
Exploit probability: 1.0% · EPSS, next 30 days
Record status: Modified

Affected

Openvpn 2.0
Openvpn 2.0.1_rc1
Openvpn 2.0.1_rc2
Openvpn 2.0.1_rc3
Openvpn 2.0.1_rc4
Openvpn 2.0.1_rc5
Openvpn 2.0.1_rc6
Openvpn 2.0.1_rc7

Attack profile CVSS 2.0 · 2.6

Attack vector: Network
Complexity: High
Authentication: None
Confidentiality: None
Integrity: None
Availability: Partial

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2005-2534.md and follow it. Check whether this project is affected by CVE-2005-2534. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record