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    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:Nov 2, 2005
    Last Modified:Apr 16, 2026
    EPS:Nov 2, 2005
    EPSS Score:0.02512
    CVSS Score:5

    Affected Products

    Vendor
    Openvpn
    Product
    Openvpn
    Vendor
    Openvpn
    Product
    Openvpn Access Server

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-84732 (CVSS 8.7) — Retransmissions of ACK packet ID in OpenVPN through 2.6.22 and 2.7.6 allow remote unauthenticated attackers to…
    CVE-2026-84256 (CVSS 7.7) — An argument parsing issue in OpenVPN 2.1_rc10 through 2.6.22 and 2.7_alpha1 through 2.7.6 on Windows allows re…
    CVE-2026-84226 (CVSS 8.5) — OpenVPN version 2.5.0 through 2.6.22 and 2.7_alpha1 through 2.7.6 on Windows allows local authenticated users …
    CVE-2026-82312 (CVSS 1.8) — OpenVPN 2.0.0 through 2.6.22 and 2.7_alpha1 through 2.7.6 on Windows allows local authenticated users to cause…
    CVE-2026-81830 (CVSS 5.6) — The Windows interactive service in OpenVPN 2.4.0 through 2.6.22 allows local authenticated users to bypass the…
    CVE-2026-81738 (CVSS 2.3) — OpenVPN 2.5.0 through 2.7.6 on Windows using the tap-windows6 driver allows attackers to trigger an out-of-bou…
    CVE-2026-78221 (CVSS 5.9) — An incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 al…
    CVE-2026-78043 (CVSS 5.6) — The Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to bypass…
    CVE-2026-63650 (CVSS 2) — OpenVPN 2.7_alpha1 through 2.7.5 using mbedTLS allows remote authenticated users to be misidentified by ignori…
    CVE-2026-63649 (CVSS 4.1) — The Windows interactive service in OpenVPN 2.4.0 through 2.6.21 and 2.7_alpha1 through 2.7.5 allows local auth…

    References

    http://openvpn.net/changelog.html
    http://secunia.com/advisories/17376
    http://secunia.com/advisories/17447
    http://secunia.com/advisories/17452
    http://secunia.com/advisories/17480
    http://www.debian.org/security/2005/dsa-885
    http://www.gentoo.org/security/en/glsa/glsa-200511-07.xml
    http://www.novell.com/linux/security/advisories/2005_25_sr.html
    http://www.osvdb.org/20416
    http://www.securityfocus.com/archive/1/415487
    http://www.securityfocus.com/bid/15270
    http://openvpn.net/changelog.html
    http://secunia.com/advisories/17376
    http://secunia.com/advisories/17447
    http://secunia.com/advisories/17452
    http://secunia.com/advisories/17480
    http://www.debian.org/security/2005/dsa-885
    http://www.gentoo.org/security/en/glsa/glsa-200511-07.xml
    http://www.novell.com/linux/security/advisories/2005_25_sr.html
    http://www.osvdb.org/20416
    http://www.securityfocus.com/archive/1/415487
    http://www.securityfocus.com/bid/15270

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High