UpHeron
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Servers and applications

CVE-2005-2532

OpenVPN before 2.0.1 does not properly flush the OpenSSL error queue when a packet can not be decrypted by the server, which allows remote authenticated attackers to cause a denial of service (client disconnection) via a large number of packets that can not be decrypted.

Severity
Medium 5.0
Published
24 Aug 2005
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
2.7% in the next 30 daysHigher than 86% of CVEs. EPSS by FIRST, 12 Nov 2026
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/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-2005-2532
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2005-2532