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    CVE-2026-13122

    OpenVPN version 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers to cause a denial of service via a malformed authentication token that triggers a reachable assertion when external-auth is enabled

    Published:Jul 6, 2026
    Last Modified:Jul 8, 2026
    EPS:Jul 6, 2026
    EPSS Score:0.00468
    CVSS Score:5.3

    Affected Products

    Vendor
    Openvpn
    Product
    Openvpn

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-617 Reachable Assertion

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    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…

    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