UBUNTU-CVE-2021-3518

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    UBUNTU-CVE-2021-3518

    Published: 18 May 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-3518
    Aliases:
    USN-4991-1

    Summary:

    Details: There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability.

    References: https://ubuntu.com/security/CVE-2021-3518, https://gitlab.gnome.org/GNOME/libxml2/-/issues/237, https://gitlab.gnome.org/GNOME/libxml2/-/commit/1098c30a040e72a4654968547f415be4e4c40fe7, https://ubuntu.com/security/notices/USN-4991-1, https://www.cve.org/CVERecord?id=CVE-2021-3518

    Affected packages

    Package

    Name: libxml2

    Purl: pkg:deb/ubuntu/[email protected]+dfsg1-3ubuntu4.13+esm2?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.9.1+dfsg1-3ubuntu4.13+esm2

    Affected versions

    2.9.1+dfsg1-3ubuntu2
    2.9.1+dfsg1-3ubuntu3
    2.9.1+dfsg1-3ubuntu4
    2.9.1+dfsg1-3ubuntu4.1
    2.9.1+dfsg1-3ubuntu4.2
    2.9.1+dfsg1-3ubuntu4.3
    2.9.1+dfsg1-3ubuntu4.4
    2.9.1+dfsg1-3ubuntu4.5
    2.9.1+dfsg1-3ubuntu4.6
    2.9.1+dfsg1-3ubuntu4.7
    2.9.1+dfsg1-3ubuntu4.8
    2.9.1+dfsg1-3ubuntu4.9
    2.9.1+dfsg1-3ubuntu4.10
    2.9.1+dfsg1-3ubuntu4.11
    2.9.1+dfsg1-3ubuntu4.12
    2.9.1+dfsg1-3ubuntu4.13
    2.9.1+dfsg1-3ubuntu4.13+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-2021-3518 | CVE-DB