CVE-2005-3409

OpenVPN 2.x before 2.0.4, when running in TCP mode, allows remote attackers to cause a denial of service (segmentation fault) by forcing the accept function call to return an error status, which leads to a null dereference in an exception handler.

Published: 2005-11-02 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2005-3409 is rated Moderate Risk (48.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.51%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2005-3409

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 3.12% 2.51% -0.60%
2 2025-03-29 2.51% 3.12% +0.60%
3 2025-03-17 — 2.51% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2005-3409

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2005-3409

OS Trackers for CVE-2005-3409

vendor priority summary link
debian low CVE-2005-3409 low priority: Debian including 1 source packages (openvpn), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2005-3409
gentoo normal CVE-2005-3409: 1 GLSA(s) (200511-07), 1 atom(s) (net-misc/openvpn); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2005-3409
suse medium CVE-2005-3409 severity moderate: SUSE including 11 source package names (openvpn, openvpn-2.5.3-1.2, …), 38 product×package rows across 16 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (16 product lines)): Known Not Affected 30, Fixed 8. https://www.suse.com/security/cve/CVE-2005-3409/
ubuntu medium CVE-2005-3409 medium priority: Ubuntu including 1 source packages (openvpn), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. https://ubuntu.com/security/CVE-2005-3409

Affected software / configurations for CVE-2005-3409

Vendor Product Version Raw CPE
openvpn openvpn 2.0 cpe:2.3:a:openvpn:openvpn:2.0:*:*:*:*:*:*:*
openvpn openvpn 2.0.1_rc1 cpe:2.3:a:openvpn:openvpn:2.0.1_rc1:*:*:*:*:*:*:*
openvpn openvpn 2.0.1_rc2 cpe:2.3:a:openvpn:openvpn:2.0.1_rc2:*:*:*:*:*:*:*
openvpn openvpn 2.0.1_rc3 cpe:2.3:a:openvpn:openvpn:2.0.1_rc3:*:*:*:*:*:*:*
openvpn openvpn 2.0.1_rc4 cpe:2.3:a:openvpn:openvpn:2.0.1_rc4:*:*:*:*:*:*:*
openvpn openvpn 2.0.1_rc5 cpe:2.3:a:openvpn:openvpn:2.0.1_rc5:*:*:*:*:*:*:*
openvpn openvpn 2.0.1_rc6 cpe:2.3:a:openvpn:openvpn:2.0.1_rc6:*:*:*:*:*:*:*
openvpn openvpn 2.0.1_rc7 cpe:2.3:a:openvpn:openvpn:2.0.1_rc7:*:*:*:*:*:*:*
openvpn openvpn 2.0.2_rc1 cpe:2.3:a:openvpn:openvpn:2.0.2_rc1:*:*:*:*:*:*:*
openvpn openvpn 2.0.3_rc1 cpe:2.3:a:openvpn:openvpn:2.0.3_rc1:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta1 cpe:2.3:a:openvpn:openvpn:2.0_beta1:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta2 cpe:2.3:a:openvpn:openvpn:2.0_beta2:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta3 cpe:2.3:a:openvpn:openvpn:2.0_beta3:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta4 cpe:2.3:a:openvpn:openvpn:2.0_beta4:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta5 cpe:2.3:a:openvpn:openvpn:2.0_beta5:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta6 cpe:2.3:a:openvpn:openvpn:2.0_beta6:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta7 cpe:2.3:a:openvpn:openvpn:2.0_beta7:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta8 cpe:2.3:a:openvpn:openvpn:2.0_beta8:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta9 cpe:2.3:a:openvpn:openvpn:2.0_beta9:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta10 cpe:2.3:a:openvpn:openvpn:2.0_beta10:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta11 cpe:2.3:a:openvpn:openvpn:2.0_beta11:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta12 cpe:2.3:a:openvpn:openvpn:2.0_beta12:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta13 cpe:2.3:a:openvpn:openvpn:2.0_beta13:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta15 cpe:2.3:a:openvpn:openvpn:2.0_beta15:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta16 cpe:2.3:a:openvpn:openvpn:2.0_beta16:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta17 cpe:2.3:a:openvpn:openvpn:2.0_beta17:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta18 cpe:2.3:a:openvpn:openvpn:2.0_beta18:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta19 cpe:2.3:a:openvpn:openvpn:2.0_beta19:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta20 cpe:2.3:a:openvpn:openvpn:2.0_beta20:*:*:*:*:*:*:*
openvpn openvpn 2.0_beta28 cpe:2.3:a:openvpn:openvpn:2.0_beta28:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc1 cpe:2.3:a:openvpn:openvpn:2.0_rc1:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc2 cpe:2.3:a:openvpn:openvpn:2.0_rc2:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc3 cpe:2.3:a:openvpn:openvpn:2.0_rc3:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc4 cpe:2.3:a:openvpn:openvpn:2.0_rc4:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc5 cpe:2.3:a:openvpn:openvpn:2.0_rc5:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc6 cpe:2.3:a:openvpn:openvpn:2.0_rc6:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc7 cpe:2.3:a:openvpn:openvpn:2.0_rc7:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc8 cpe:2.3:a:openvpn:openvpn:2.0_rc8:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc9 cpe:2.3:a:openvpn:openvpn:2.0_rc9:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc10 cpe:2.3:a:openvpn:openvpn:2.0_rc10:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc11 cpe:2.3:a:openvpn:openvpn:2.0_rc11:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc12 cpe:2.3:a:openvpn:openvpn:2.0_rc12:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc13 cpe:2.3:a:openvpn:openvpn:2.0_rc13:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc14 cpe:2.3:a:openvpn:openvpn:2.0_rc14:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc15 cpe:2.3:a:openvpn:openvpn:2.0_rc15:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc16 cpe:2.3:a:openvpn:openvpn:2.0_rc16:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc17 cpe:2.3:a:openvpn:openvpn:2.0_rc17:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc18 cpe:2.3:a:openvpn:openvpn:2.0_rc18:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc19 cpe:2.3:a:openvpn:openvpn:2.0_rc19:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc20 cpe:2.3:a:openvpn:openvpn:2.0_rc20:*:*:*:*:*:*:*
openvpn openvpn 2.0_rc21 cpe:2.3:a:openvpn:openvpn:2.0_rc21:*:*:*:*:*:*:*
openvpn openvpn 2.0_test1 cpe:2.3:a:openvpn:openvpn:2.0_test1:*:*:*:*:*:*:*
openvpn openvpn 2.0_test2 cpe:2.3:a:openvpn:openvpn:2.0_test2:*:*:*:*:*:*:*
openvpn openvpn 2.0_test3 cpe:2.3:a:openvpn:openvpn:2.0_test3:*:*:*:*:*:*:*
openvpn openvpn 2.0_test5 cpe:2.3:a:openvpn:openvpn:2.0_test5:*:*:*:*:*:*:*
openvpn openvpn 2.0_test6 cpe:2.3:a:openvpn:openvpn:2.0_test6:*:*:*:*:*:*:*
openvpn openvpn 2.0_test7 cpe:2.3:a:openvpn:openvpn:2.0_test7:*:*:*:*:*:*:*
openvpn openvpn 2.0_test8 cpe:2.3:a:openvpn:openvpn:2.0_test8:*:*:*:*:*:*:*
openvpn openvpn 2.0_test9 cpe:2.3:a:openvpn:openvpn:2.0_test9:*:*:*:*:*:*:*
openvpn openvpn 2.0_test10 cpe:2.3:a:openvpn:openvpn:2.0_test10:*:*:*:*:*:*:*
openvpn openvpn 2.0_test11 cpe:2.3:a:openvpn:openvpn:2.0_test11:*:*:*:*:*:*:*
openvpn openvpn 2.0_test12 cpe:2.3:a:openvpn:openvpn:2.0_test12:*:*:*:*:*:*:*
openvpn openvpn 2.0_test14 cpe:2.3:a:openvpn:openvpn:2.0_test14:*:*:*:*:*:*:*
openvpn openvpn 2.0_test15 cpe:2.3:a:openvpn:openvpn:2.0_test15:*:*:*:*:*:*:*
openvpn openvpn 2.0_test16 cpe:2.3:a:openvpn:openvpn:2.0_test16:*:*:*:*:*:*:*
openvpn openvpn 2.0_test17 cpe:2.3:a:openvpn:openvpn:2.0_test17:*:*:*:*:*:*:*
openvpn openvpn 2.0_test18 cpe:2.3:a:openvpn:openvpn:2.0_test18:*:*:*:*:*:*:*
openvpn openvpn 2.0_test19 cpe:2.3:a:openvpn:openvpn:2.0_test19:*:*:*:*:*:*:*
openvpn openvpn 2.0_test20 cpe:2.3:a:openvpn:openvpn:2.0_test20:*:*:*:*:*:*:*
openvpn openvpn 2.0_test21 cpe:2.3:a:openvpn:openvpn:2.0_test21:*:*:*:*:*:*:*
openvpn openvpn 2.0_test22 cpe:2.3:a:openvpn:openvpn:2.0_test22:*:*:*:*:*:*:*
openvpn openvpn 2.0_test23 cpe:2.3:a:openvpn:openvpn:2.0_test23:*:*:*:*:*:*:*
openvpn openvpn 2.0_test24 cpe:2.3:a:openvpn:openvpn:2.0_test24:*:*:*:*:*:*:*
openvpn openvpn 2.0_test26 cpe:2.3:a:openvpn:openvpn:2.0_test26:*:*:*:*:*:*:*
openvpn openvpn 2.0_test27 cpe:2.3:a:openvpn:openvpn:2.0_test27:*:*:*:*:*:*:*
openvpn openvpn 2.0_test29 cpe:2.3:a:openvpn:openvpn:2.0_test29:*:*:*:*:*:*:*
openvpn openvpn_access_server 2.0.1 cpe:2.3:a:openvpn:openvpn_access_server:2.0.1:*:*:*:*:*:*:*
openvpn openvpn_access_server 2.0.2 cpe:2.3:a:openvpn:openvpn_access_server:2.0.2:*:*:*:*:*:*:*

References for CVE-2005-3409

cvelogic Threat Intelligence