UBUNTU-CVE-2021-3716

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    UBUNTU-CVE-2021-3716

    Published: 2 Mar 2022Last Modified: 20 May 2026
    Upstream:
    CVE-2021-3716

    Summary:

    Details: A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.

    References: https://ubuntu.com/security/CVE-2021-3716, https://access.redhat.com/security/cve/CVE-2021-3716, https://listman.redhat.com/archives/libguestfs/2021-August/msg00077.html, https://www.cve.org/CVERecord?id=CVE-2021-3716

    Affected packages

    Package

    Name: nbdkit

    Purl: pkg:deb/ubuntu/nbdkit?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.1.10-1
    1.1.11-1
    1.1.11-1build1

    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-2021-3716 | CVE-DB