UBUNTU-CVE-2021-3541

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    UBUNTU-CVE-2021-3541

    Published: 18 May 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-3541
    Aliases:
    USN-4991-1

    Summary:

    Details: A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.

    References: https://ubuntu.com/security/CVE-2021-3541, https://bugzilla.redhat.com/show_bug.cgi?id=1950515, https://gitlab.gnome.org/GNOME/libxml2/-/commit/8598060bacada41a0eb09d95c97744ff4e428f8e, https://gitlab.gnome.org/GNOME/libxml2/-/issues/228, https://blog.hartwork.org/posts/cve-2021-3541-parameter-laughs-fixed-in-libxml2-2-9-11/, https://ubuntu.com/security/notices/USN-4991-1, https://www.cve.org/CVERecord?id=CVE-2021-3541

    Affected packages

    Package

    Name: libxml2

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-5ubuntu0.20.04.1?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.9.10+dfsg-5ubuntu0.20.04.1

    Affected versions

    2.9.4+dfsg1-7ubuntu3
    2.9.4+dfsg1-7ubuntu5
    2.9.4+dfsg1-8ubuntu1
    2.9.4+dfsg1-8ubuntu2
    2.9.4+dfsg1-8ubuntu3
    2.9.10+dfsg-1ubuntu3
    2.9.10+dfsg-4build1
    2.9.10+dfsg-5

    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-2021-3541 | CVE-DB