CVE catalog

CVE-2005-2534

openvpn: CVE-2005-2534

Severity: Critical
Published: Aug 24, 2005, 4:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.97% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	openvpn	sid	`2.7.8-1`	fixed
Debian	openvpn	forky	`2.7.8-1`	fixed
Debian	openvpn	trixie	`2.6.14-1+deb13u3`	fixed
Debian	openvpn	trixie-security	`2.6.14-1+deb13u3`	fixed
Debian	openvpn	bookworm	`2.6.14-0+deb12u2`	fixed
Debian	openvpn	bookworm-security	`2.6.14-0+deb12u2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openvpn	source	sid	`2.0.2-1`	high	Not reported	[324167]
Debian	openvpn	source	forky	`2.0.2-1`	high	Not reported	[324167]
Debian	openvpn	source	trixie	`2.0.2-1`	high	Not reported	[324167]
Debian	openvpn	source	bookworm	`2.0.2-1`	high	Not reported	[324167]

[Debian bug #324167]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[openvpn]Unknown
Details (4)
- 2.6.14-0+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · bookworm; dsa · openvpn · debian · 12
- 2.6.14-0+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · bookworm; dsa · openvpn · debian · 12
- 2.6.14-0+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · bookworm; dsa · openvpn · debian · 12
- 2.6.14-0+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · bookworm; dsa · openvpn · debian · 12

[Debian 13 (Trixie)]

[openvpn]Unknown
Details (6)
- 2.6.14-1+deb13u3 · amd64 · trixie
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · 13
- 2.6.14-1+deb13u3 · arm64 · trixie
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · 13
- 2.7.5-1~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · 13
- 2.7.5-1~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · 13
- 2.6.14-1+deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · 13
- 2.6.14-1+deb13u3 · arm64 · trixie-security
  Fixed · Fixed: 2.0.2-1
  dsa · openvpn · debian · 13

Observed: Oct 23, 2026, 5:02:38 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]