UpHeron
All vulnerabilities

Servers and applications

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.

Severity
Low 2.6
Published
24 Aug 2005
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1% in the next 30 daysHigher than 62% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · Only under certain conditions · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:H/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
OpenVPNServers and applications · cpe:a:openvpn:openvpn
  • Version 2.0.1_rc7
  • Version 2.0.1_rc6
  • Version 2.0.1_rc5
  • Version 2.0.1_rc4
All 74 release lines
  • Version 2.0_beta1
  • Version 2.0_beta2
  • Version 2.0_beta3
  • Version 2.0_beta4
  • Version 2.0_beta5
  • Version 2.0_beta6
  • Version 2.0_beta7
  • Version 2.0_beta8
  • Version 2.0_beta9
  • Version 2.0_beta10
  • Version 2.0_beta11
  • Version 2.0_beta12
  • Version 2.0_beta13
  • Version 2.0_beta15
  • Version 2.0_beta16
  • Version 2.0_beta17
  • Version 2.0_beta18
  • Version 2.0_beta19
  • Version 2.0_beta20
  • Version 2.0_beta28
  • Version 2.0_rc1
  • Version 2.0_rc2
  • Version 2.0_rc3
  • Version 2.0_rc4
  • Version 2.0_rc5
  • Version 2.0_rc6
  • Version 2.0_rc7
  • Version 2.0_rc8
  • Version 2.0_rc9
  • Version 2.0_rc10
  • Version 2.0_rc11
  • Version 2.0_rc12
  • Version 2.0_rc13
  • Version 2.0_rc14
  • Version 2.0_rc15
  • Version 2.0_rc16
  • Version 2.0_rc17
  • Version 2.0_rc18
  • Version 2.0_rc19
  • Version 2.0_rc20
  • Version 2.0_rc21
  • Version 2.0
  • Version 2.0_test1
  • Version 2.0_test2
  • Version 2.0_test3
  • Version 2.0_test5
  • Version 2.0_test6
  • Version 2.0_test7
  • Version 2.0_test8
  • Version 2.0_test9
  • Version 2.0_test10
  • Version 2.0_test11
  • Version 2.0_test12
  • Version 2.0_test14
  • Version 2.0_test15
  • Version 2.0_test16
  • Version 2.0_test17
  • Version 2.0_test18
  • Version 2.0_test19
  • Version 2.0_test20
  • Version 2.0_test21
  • Version 2.0_test22
  • Version 2.0_test23
  • Version 2.0_test24
  • Version 2.0_test26
  • Version 2.0_test27
  • Version 2.0_test29
  • Version 2.0.1_rc1
  • Version 2.0.1_rc2
  • Version 2.0.1_rc3
  • Version 2.0.1_rc4
  • Version 2.0.1_rc5
  • Version 2.0.1_rc6
  • Version 2.0.1_rc7

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2005-2534
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2005-2534