UBUNTU-CVE-2021-3517

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    UBUNTU-CVE-2021-3517

    Published: 19 May 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-3517
    Aliases:
    USN-4991-1

    Summary:

    Details: There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker who is able to supply a crafted file to be processed by an application linked with the affected functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to application availability, with some potential impact to confidentiality and integrity if an attacker is able to use memory information to further exploit the application.

    References: https://ubuntu.com/security/CVE-2021-3517, https://gitlab.gnome.org/GNOME/libxml2/-/issues/235, https://gitlab.gnome.org/GNOME/libxml2/-/commit/bf22713507fe1fc3a2c4b525cf0a88c2dc87a3a2, https://ubuntu.com/security/notices/USN-4991-1, https://www.cve.org/CVERecord?id=CVE-2021-3517

    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-2021-3517 | CVE-DB