UBUNTU-CVE-2025-11677

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    UBUNTU-CVE-2025-11677

    Published: 20 Oct 2025Last Modified: 22 Apr 2026
    Upstream:
    CVE-2025-11677
    Aliases:
    USN-8024-1

    Summary:

    Details: Use After Free in WebSocket server implementation in lws_handshake_server in warmcat libwebsockets may allow an attacker, in specific configurations where the user provides a callback function that handles LWS_CALLBACK_HTTP_CONFIRM_UPGRADE, to achieve denial of service.

    References: https://ubuntu.com/security/CVE-2025-11677, https://www.cve.org/CVERecord?id=CVE-2025-11677, https://libwebsockets.org/git/libwebsockets/commit?id=2f082ec31261f556969160143ba94875d783971a, https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11677, https://ubuntu.com/security/notices/USN-8024-1

    Affected packages

    Package

    Name: libwebsockets

    Purl: pkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-apps/focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.2.1-3ubuntu0.1~esm1

    Affected versions

    2.0.3-3build1

    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
    UBUNTU-CVE-2025-11677 | CVE-DB