USN-4966-2

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    USN-4966-2

    Published: 25 May 2021Last Modified: 29 Jun 2026

    Summary: libx11 vulnerability

    Details: USN-4966-1 fixed a vulnerability in libx11. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. Original advisory details: It was discovered that libx11 incorrectly validated certain parameter lengths. A remote attacker could possibly use this issue to trick libx11 into emitting extra X protocol requests.

    References: https://ubuntu.com/security/notices/USN-4966-2, https://ubuntu.com/security/CVE-2021-31535

    Affected packages

    Package

    Name: libx11

    Purl: pkg:deb/ubuntu/libx11?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2:1.6.2-1ubuntu2.1+esm2

    Affected versions

    2:1.6.1-1ubuntu1
    2:1.6.1-1ubuntu2
    2:1.6.2-1ubuntu1
    2:1.6.2-1ubuntu2
    2:1.6.2-1ubuntu2.1
    2:1.6.2-1ubuntu2.1+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
    USN-4966-2 | CVE-DB