UBUNTU-CVE-2021-4209

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    UBUNTU-CVE-2021-4209

    Published: 22 Feb 2022Last Modified: 22 Jul 2026
    Upstream:
    CVE-2021-4209

    Summary:

    Details: A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.

    References: https://ubuntu.com/security/CVE-2021-4209, https://access.redhat.com/security/cve/CVE-2021-4209, https://ubuntu.com/security/notices/USN-5550-1, https://ubuntu.com/security/notices/USN-5750-1, https://www.cve.org/CVERecord?id=CVE-2021-4209

    Affected packages

    Package

    Name: gnutls26

    Purl: pkg:deb/ubuntu/gnutls26?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.12.23-1ubuntu4
    2.12.23-1ubuntu5
    2.12.23-12ubuntu1
    2.12.23-12ubuntu2
    2.12.23-12ubuntu2.1
    2.12.23-12ubuntu2.2
    2.12.23-12ubuntu2.3
    2.12.23-12ubuntu2.4
    2.12.23-12ubuntu2.5
    2.12.23-12ubuntu2.6
    2.12.23-12ubuntu2.7
    2.12.23-12ubuntu2.8
    2.12.23-12ubuntu2.10+esm1

    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-2021-4209 | CVE-DB