CVE-2021-4209

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    CVE-2021-4209

    Published: 24 Aug 2022Last Modified: 7 Aug 2026

    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://access.redhat.com/security/cve/CVE-2021-4209, https://gitlab.com/gnutls/gnutls/-/issues/1306, https://gitlab.com/gnutls/gnutls/-/merge_requests/1503, https://security.netapp.com/advisory/ntap-20220915-0005/, https://bugzilla.redhat.com/show_bug.cgi?id=2044156, https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -f213ec01faa8fd7e7478f85a76352be875f53e4b

    Affected versions

    3.7.2
    3.7.1
    3.7.0

    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
    CVE-2021-4209 | CVE-DB