UBUNTU-CVE-2021-3537

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    UBUNTU-CVE-2021-3537

    Published: 14 May 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-3537
    Aliases:
    USN-4991-1

    Summary:

    Details: A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.

    References: https://ubuntu.com/security/CVE-2021-3537, https://gitlab.gnome.org/GNOME/libxml2/-/issues/243, https://gitlab.gnome.org/GNOME/libxml2/-/issues/244, https://gitlab.gnome.org/GNOME/libxml2/-/issues/245, https://gitlab.gnome.org/GNOME/libxml2/-/commit/babe75030c7f64a37826bb3342317134568bef61, https://ubuntu.com/security/notices/USN-4991-1, https://www.cve.org/CVERecord?id=CVE-2021-3537

    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-2021-3537 | CVE-DB