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    CVE-2025-3110

    OpenVPN Access Server 2.7.2 through 3.1.0 accepts bare line-feed sequences inside HTTP header values, allowing remote attackers to perform HTTP request smuggling when deployed behind a reverse proxy

    Published:Jul 8, 2026
    Last Modified:Jul 10, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00308
    CVSS Score:5.3

    Affected Products

    Vendor
    Openvpn
    Product
    Openvpn Access Server

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Related CVEs

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    CVE-2023-46850 (CVSS 9.8) — Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or rem…
    CVE-2023-46849 (CVSS 7.5) — Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker …
    CVE-2021-4234 (CVSS 7.5) — OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a…
    CVE-2022-33738 (CVSS 7.5) — OpenVPN Access Server before 2.11 uses a weak random generator used to create user session token for the web p…
    CVE-2022-33737 (CVSS 7.5) — The OpenVPN Access Server installer creates a log file readable for everyone, which from version 2.10.0 and be…
    CVE-2021-3824 (CVSS 6.1) — OpenVPN Access Server 2.9.0 through 2.9.4 allow remote attackers to inject arbitrary web script or HTML via th…
    CVE-2020-36382 (CVSS 7.5) — OpenVPN Access Server 2.7.3 to 2.8.7 allows remote attackers to trigger an assert during the user authenticati…
    CVE-2020-15077 (CVSS 5.3) — OpenVPN Access Server 2.8.7 and earlier versions allows a remote attackers to bypass authentication and access…
    CVE-2020-15074 (CVSS 7.5) — OpenVPN Access Server older than version 2.8.4 and version 2.9.5 generates new user authentication tokens inst…

    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